Don't hear me wrong. I see him to rebounding like what Harden has been to scoring - amazingly gifted, but I'm not sure what the whole package gives you. I think we need to move on from Drummond unless we can get him for a lot less than I think we can. But there is a reason we are not going to be able to sign him cheap. He won't get the $30M he wants, but if Adams, Gobert, Vucevic and Horford are worth north of $25M then surely Drummond is in 20+ range.
That said - I like Allen long term and I think he fits our team better, but he is not a better scorer than Drummond. He rarely misses because he rarely shoots - the 7 shots a game he's taken with us are the highest in his career. I'd prefer Drummond shoot less and, more importantly, show better shot selection. But one of the reasons he shoots more is he can put the ball in the hole. And if you watch the way other teams defend him vs Allen, you'll see they know that also. And, by any measure, Drummond is an incredible rebounder: His career average is higher than Rodman and Rodman did nothing else. Rodman in his prime is the best rebounder I've ever seen, but you literally have to go back to Rodman's prime years to find someone putting up better numbers than Drummond. He has led the league for the last 3 years and is leading it again this year. He is the only player in the modern era to be in the top 10 in average rebounds per game. Like it or not, he is covering a lot of our weaknesses on the boards. We are already a mediocre rebounding team. We will be less than that when he leaves.
Again, I'm on record for keeping Allen and shipping Drummond. But saying that, it's clear that Drummond is the more productive player of the two right now.