drawing 4 or 5 in draw poker

[bigpooch]

Apparently, you forgot that the BB has a free play. If so,
he often has to draw to rags and when facing a bet from a
player that is possibly betting a busted draw, calling with
22 is very reasonable: it's in the top half of the hands one
ends up with after drawing four.

When drawing four, there is also the additional question as
to which hands you would bluff with and it seems more likely
(from what I have seen) the BB will be called more often
after drawing four cards than after drawing three cards.