hm, unless im mistaken wasnt there some indication in the minus 1 generation x issue that darkbeast had actually suffered some severe memory loss after his transfer o 616? perhaps his mind was clouded during the majority of the early years, so that it simply did not occur to him to look up his own counterparts. or perhaps he simply did not have the resources to safely research the x-men/superheroes of 616. or perhaps, as previously stated, his fear of sinister kept him both busy and far far away from x-factor, where he might possibly have had the biggest chance of recognising 616 hank.
secondly even though darkbeast himself went through a (possibly self inflicted) mutation, what is there to suggest that he would assume that his 616 counterpart had gone through a similiar mutation, allbeit with a different result? perhaps it nevver occurred to him that well liked blue furball associated with the heroic avengers was his counterpart.
on the same topic, i seem to have some form of recolection that darkbeast had contact with the sugarman after they crossed over to 616. is there any indication to the extent of this connection? when did they become aware of eachother?
how he knew/recognised bishop however is beyond me. perhaps there was something about the Mkran timeline snapping back into place (teleported 20years into the past being half out of synch, catching up to the present = catalyst for the drop of a mental penny.)