Playing ~460 person $5+.50 MTT on Ignition, average stack just over 25k, ~160 remaining

Blinds 400/800-80

Hero: 23,315, solid tight image. Just raised button and CO and folded to SB's all-ins (Villian B).
Villain A: 77,409, 3rd in chips, calling wide, close to maniac
Villain B: 9,400, not much info

Hero has AK on button.

Folds to A in CO, bets 1600.
Hero raises to 3500.
B in SB goes all-in for 9,320.
A goes all-in for 77,329.

What are your thoughts?

I make the call. Given your read on A, he could be shoving pretty wide knowing he has such a big chip lead over both you and B. And he is likely trying to isolate B by forcing you out of the pot. So I think you're in good shape against his range here and winning this pot will give you a pretty big stack.

What range should I expect here from B (SB)?

I would call because your 3bet sizing looks like youre 3betting light.. and I would 3bet bigger pre

As mentioned already, I'd definitely would 3bet a bit bigger. Something like 4500.

He's re-shove definitely looks like an isolation, but if we'd give him a fairly tight range of doing that (55+, AQs+, KQs+, AQo+), we'd be getting it in with ~50% against that range.

I think you're flipping here most of the time, sometimes dominating, and very rarely dominated by AA/KK.

I actually had almost identical situation today with AKs and decided to have a go. Obviously I faced AA, but as mentioned, he's going to have a lot more of hands we'd be happy to see.

EDIT:

Sidenote:

I actually think I'd call more happily against a good player, since they're more likely capable of isolating with wider range here.

I think the 3Bet sizing is OK - I might go a fraction bigger but what hero did is fine.

Great - we're getting lol pot odds that makes this a clear call IMO. Given villain's read I think villain is probably shoving wider than this. AKs also does well in multi-way all ins.