Is Jones an upgrade over Allen? Isn't Davis more a Matt Bullard type big man than a defender and rebounder?
No, Davis is a legit big, not a perimeter player. He's not done much in the league to date, but that may be because he's been with a lousy franchise. Admittedly, his ceiling is probably not much higher than Dwayne Jones'.
I don't think Jones is an upgrade over Allen. A cheap replacement, perhaps, if TA is dealt.