his lateral speed is actually very good when he locks in and focuses (one of the best times ever in lane agility at combine); his anticipation and getting used to nba speed had been the problem along with lack of focus off ball/
size-wise, to me he actually ended up looking bigger than i expected. standing next to donovan, he's clearly taller than donovan and has always been a workout warrior at duke winning their summer belt multiple times for being the best conditioned. he definitely looks bigger than rubio. donovan physically looks bigger given his long arms and bulk relative to his height. allen is every bit of 6'4" - 6'5" in shoes and while not crazy long, he has a +4 wingspan relative to his 6'3" barefoot height. I mean, this is not a weak/small looking guy the way you're describing him, especially not when he's been 200-205 lbs.
F the stats, and watch their games, especially considering that naz and cousins had extremely high usage on ball while allen was strictly played off ball. he was quite clearly their best player when he was sent down.