He's going to play exactly the same role for Leipzig as he did with us. The fact he scored a last minute winner last week when we were losing 5-1 was a stark contrast in fortunes, but ultimately in terms of minutes on the pitch he hasn't picked the best option.
As has been said, he should have been out on loan from the start of the season to continue his education. The fact that he was one of our only fit genuine wide players at the time shows the shortcomings in our summer transfer activity.
I'd also say this has nothing really to do with Allardyce - Lookman isn't going to displace Walcott and we need Sigurdsson to babysit Martina until Baines is back. Bolasie is an option too but has still to prove that he can remember how to actually play football.