So far Jerebko is our best player in last 10 games, he has found his shooting stroke and is playing ok D.
Allen is everything you wrote, rebounder and a big who does dirty work, something we want from Zeller. Logically we would trade Zeller for Allen, but Zeller has better contract in a trade.
If Jerebko hits heavy slump, than the trade is yes, but at the moment big no.