1. While GW doesn't resist ts, I feel 5 seconds isn't enough as Alucard's actual offense options aren't that great(and GW resists everything). Supposing GW dies in the 5 second time stop, he can come back via his newly added ability of self resurrection(which is instantaneous and teleports GW to a safe distance). If he doesn't, Forced Exchange wrecks Alucard but doesn't kill. Mortal Blow then finishes Alucard off. If Alucard's soul remains, Source Vamparism/ Annihilate/ Purge erases it from existence.
2. Alucard's regen is unspecified. Is it better than GW's low-godly? Can Alucard's attacks bypass low-godly?
3. Annihilate spell from GW can cause Existence Erasure+Resurrection Prevention+Power null. I am aware Alucard resists EE but the other two effects should take place.
4. Shackles of Pain and Soul Mate(All your positive effects - including statuses and healing - are mine, and all my negative effects - including statuses and damage taken are yours) will play a huge role in this fight.
5.GW has a lot of mobility via flight and multiple types of teleportation - Minato style(via pyramids), Nether Swap(can swap positions with Alucard if he uses ranged attacks), personal teleportation, enemy teleportation and portals. Alucard will find it difficult to hit him as every type is instantaneous. Also, GW can set up attacks from blind spots via portals(Planar Gate) and Erratic Wisp can enable dodging of attacks by teleporting randomly.
6. Uncanny evasion increases dodging for GW.
7. Living on the Edge prevents death for 2 turns. That probably translates to two consecutive attacks in real time.
8. Any Silence inflicting skill will prevent Alucard from using magic. Any atrophy inflicting skill prevents Alucard from using weapons or gear.
9. GW's Sabotage skill makes Alucards bombs or arrows explode in his inventory, damaging him.
10. Various kinds of auras cause a variety of negative effects on enemy characters when approached. Auras include petrifying aura, silencing aura, decaying aura, fiery aura etc.
11. Flaming Crescendo is basically Killer Queen's 1st Bomb. It probably doesn't atomise though.
12. Deflective Barrier deflects ranged attacks back although GW still gets injured.
13. GW has a controllable berserk mode via Death Wish which amps his damage the closer he is to dying.
14. Alucard isn't resistant to petrification afaik from playing Castlevania games in the past(damn Medusa heads). GW has transmutation and petrification options, both contact based and ranged. Medusa Head skill(xd) gives GW a petrifying aura.
15. Alucard's profile doesn't state whether he can hurt intangibles or non-corporeal enemies. Divine GW can turn non-corporeal and attack too. GW can hurt intangibles/non-corporeals as well.
16. Break the Shackles can remove any statuses or binding/sealing effects whenever inflicted, including attacks to the soul.
17. GW has got an extremely good control of the battlefield. He can manipulate the battlefield itself to suit his needs. Normal, blessed and cursed variants of fire, water, smoke, ice, fog etc. surfaces can be exploited by GW to max effect.
Read this page to see how environment can be exploited in Divinity 2. Exploiting the terrain is also the basic strategy in any Divinity fight where you chain terrain effects to deal stacking status effects and immense amounts of damage.
18. GW has summons. The summons also have similar resistances to the GW himself, albeit to a lesser degree. Granted they are way weaker than the GW(although during gameplay, they deal damage higher than the GW himself for some reason, probably due to specialising in one field of magic compared to the GW's multi-specialisation). The summons can keep Alucard busy and GW can summon more when one dies(although they can only be summoned one at a time). A few summons have the Provoke skill to make Alucard concentrate attacks at them instead of GW. GW can kill his own summons to heal himself.
19. Divine GW's Terrain Transmutation can at least terraform the battlefield to give him the high ground and other advantages. In Divinity, having high ground increases damage dealt.
20. GW resists almost everything Alucard can do, other than time stop. Alucard is susceptible to a lot of GW's attacks like petrification, transmutation, various environmental effects that stack over time, power null etc.
Voting GW for sheer versatility, mobility and hax.