Remember John Randle? He played around 285 his entire career. Donald has some serious strength, benched the 225 35 times (second among def lineman). However, this is all a smoke screen--no GM's make it known that obvious they want a player in the first round 2 months til the draft
People get hung up on Donald's size even though there's already a well-established precedent of players his size at his position being damned good for a long time. There's actually a pretty extensive history of quick, under-sized three technique DTs having tremendous success in the NFL. In fact, other than QB I can't think of a position where size has been so over-valued for so long. Donald elicits many comparisons to Atkins, and people act like Atkins was the first under-sized three tech to be any good. In reality, guys like Atkins, Sapp, Glover, Randle, etc. have been playing at Pro Bowl and HOF levels for 30 years. All were 6'2" or below and played at 290-300lbs. Then there's an even wider pool of guys who played at the same weight but were average height at 6'3" or 6'4", Tommie Harris and Henry Melton being the most relevant Bears examples. It's not like Donald would be breaking the mold. If anything, he fits it.