From WOG, this is said:
Q: About how many people would have to work together to defeat Reinhard?
A: The four strongest characters in the story, after Reinhard, couldn’t defeat him working together.
Q: Out of the archbishops and witches, are there any of them that could, with full preparation and fighting him on their favored terrain, have a chance to win, or a chance to fight to a draw, or at least take long enough losing to buy some time?
A:
If it’s the witches, Sekhmet might be able to buy some time. If it’s the archbishops, it’s spoilers so I can’t say.(note: spoiler was Regulus) (October 09, 2014 arc5)-
Fighting Strength, Additional Q&A
This is actual cool that i found it, cause a couple of the witches have passive abilities, ie Carmelia who passively causes you to love her and your heart to stop, so i think he clearly has resistances to their stuff, since only Sekhmet can buy time.
As for the archbishops besides Sirius, their stuff isn't passive, but here the question is about full preparation on their favored terrain. Surprise attacks and the like won't work on Reinhard due to him instinctively dodging stuff he comes across the first time, and his massive speed, however if we are taking about a hostage scenario, as seen by Regulus, Reinhard will allow his enemy to attack him, his blessings are passive, but he can consciously turn them off.
If Ley or Roy with full prep show up against Reinhard with a hostage in toe cause they know they can't beat Reinhard, and they want to touch him to then activate their authority, he will let it happen, and apparently that won't let them win. I think it's at least a likely scenario.
Other q&a's basically reiterate the same, that even with everyone working together, Reinhard is impossible to defeat
Q: Reinhard can’t be defeated.
A: No on can defeat him.
Q: Let’s all work together and take down Reinhard! (Proposal)
A: IMPOSSIBRU!!
Q: So, for the moment, it would be ok to understand that it’s impossible to defeat Reinhard?
A: For the moment, it’s impossible.-
Reinhard Q&A 1/2
There are people who are at least physically on the level of Reinhard, so even from that angle you could go with those guys holding him down, while Gluttony comes up and touches him, and again seems it wouldn't work.
I think you can stretch this pretty far honestly, however i think passive abilities from archbishops and witches clearly won't work, and considering the evidence of Reid showing a resistance to Gluttony's authority, and these scenario's of prep, and Reinhard also already showing resistance to another authority, it is likely imo he resists Gluttony's direct application of their ability, but i wouldn't say it's confirmed.