Holgate -- getting more minutes at WBA than he would have here. Smart to send him on loan as we have 4 senior CBs and 2 capable (natural) right-backs.
Beni -- has made one appearance for Wigan. How many times have we expected players to be the next best thing only to not make it?
Vlasic -- wanted more minutes than he would've gotten here so it was the right decision to send him on loan.
Davies is the only one you could possibly make an argument about, but he's not as good as Gomes, Schneiderlin, and yes, Gana (an opinion that most pundits/coaches/teammates/fans/etc. would agree with).
At this point, I really think you're just trolling. You can't honestly say you know anything about football and still not see what Gana brings to the team.