3. Once again, thank you for that information. I do feel like using wands/staffs is simply a habit of most wizards. Though Jee-Han has his staff because it increases his mana attacking strength, among other things. However, for all those who can't fly, my point about shaking the earth is still valid.
4. Very true, he wouldn't be able to read hundreds of observes at once. I suppose he likely wouldn't need to as he would have prior knowledge, and would likely be able to recognize each spell by appearance alone. And, as hogwarts also has prior knowledge, they would likely be able to nigh one shot his golems. But Jee-Han can always just pull out golems without spirits, or even the earth ones from way back. It's not as though he's lost the ability to summon them. His current ones are simply superior in most cases, so he typically opts for them. Prior knowledge would let him know not to summon the ones with spirits. So yes, summoning golems with spirits wouldn't be very efective, but he could just as easily summon ones without spirits.
Also, speed is equalized, so how fast the brooms are is irrevelant. As is Jee-Han's flight speed, which is superior to their broom speed anyway.
Jee-Han does not have to stay still to make the most of his AP advantage, or to keep his current AP level. AP isn't something that changes because someone decides to fly instead of run, or because someone takes a single step forward. Also, I seem to have been implying, accidentally, that Jee-Han would stay in one spot, which is far from the case. Rarely does he stay in one spot, and he almost always takes to flight.
Jee-Han's barrier also protects him from more than just magic. It's a general barrier, so it also protects him from physical things, such as the impact of an explosion, falling debris, etc. So if an attack fired from a wand has physical impact force, it would likely have a physical interaction with the barrier, and the barrier would hold up as its durability is superior. The point as to his immense mana regeration and him being able to regenerate an outrageous number of mana shields for each one destroyed still holds true, in particular since they can be layered, and often are layered.
Once again, nothing here truly solves the issue of Jee-Han's AP, which will one shot everything, wizards, golems, etc. Doing the math, highballing each wizard to be 9-A, it would take about 200,000 spells to produce the AP equivalent to an 8-A attack, and that's bearing the fact that 8-A attacks cannot one shot his mana barriers. And also bearing the fact that Jee-Han would be avoiding the vast majority of the attacks. Comparing this to the barrier that Hogwarts has, Jee-Han would be able to drill some holes in it in a matter of seconds seeing as how each one of his arrows is that mana spells put into one.
His time acceleration would certainly come in handy here, as he'd be able to react much faster than anyone else. A small point, but it could certainly prove useful.
The word sleep reminds me that he does have sleep inducement. So he could potentially put anyone to sleep who gets too close, whether they be teleporters, broom stick riders or something else, and have them fall to their death.
@Risci-Viragosi
I'd stay away from the ID barriers argument. By that logic he can technically BFR people into his own dimension. But seeing as how that doesn't work in verse as anyone with sufficient power and knowledge can break out, I don't think it's fair to assume it's combat applicable when it's not even combat applicable in verse. Any arguments about his resting up in an ID barrier and things of that nature are a bit iffy too, as they'd likely be there with him regardless. Jee-Han hasn't shown the ability to eject people from his ID barriers.