The season he came was Rafa's last, he came injured and that was key. He just had no momentum and couldn't make an impact. He was pretty poor in the games he did play, though.
It's a mystery why he was loaned out twice by two different managers, who knows what goes on in training, maybe his attitude isn't right? Who knows.
Hilarious to see people writing Allen off when he's been a Liverpool player for less than 24 hours. This is the problem with fans now, they don't give anyone a chance of being successful or proving themselves.