defend A6o in the BB?

While playing a sat. into the sunday storm I encountered this situation on the first hand.  I folded but in retrospect I wish I had called.  Folding is correct if our opponent is shoving 15% of hands but incorrect if he is shoving 20% of hands.

Hold'em Simulation ? 
282,530,160 trials (Exhaustive)

Hand	Equity	Wins	Ties
15%	62.56%	168,672,942	16,155,117
As6c	37.44%	97,702,101	16,155,117

Hold'em Simulation ? 
393,829,920 trials (Exhaustive)

Hand	Equity	Wins	Ties
20%	58.72%	220,060,198	22,367,722
As6c	41.28%	151,402,000	22,367,722

Against looser shoves we do better.  It is possible that our opponent is shoving a polarized range; propokertools hand rankings and mostly based on high card strength although KQ out ranks A9 and both outrank 66 so there is some consideration given to other factors. Ignoring this for now the question becomes what % of hands is our opponent shoving in this scenario? The hold'em resources calculator suggests 22.2% shoving range of 

"22.2%, 22+ A2s+ ATo+ K7s+ KTo+ Q8s+ QTo+ J9s+ T8s+ 98s".

Hold'em Simulation ? 
306,502,416 trials (Exhaustive)

Hand	Equity	Wins	Ties
22+, Ax2x+, AyTx+, Kx7x+, KxTy+, Qx8x+, QxTy+, Jx9x+, Tx8x+, 9x8x	59.07%	176,897,795	8,283,354
Ac6h	40.93%	121,321,267	8,283,354

Actually against this exact range we are just shy of the exact equity needed to make the call. It would essentially be a break even call. I think you probably need a slight amount of positive expected value to make calling better than folding since ceteris paribus you would want to choose the situation with less variance. So perhaps it was correct to fold vs UTG in this situation but vs any other position this should be a slam dunk call.