I actually like all 3.
Tuitt would be a DT in the majority of 4-3 schemes IMO. He'd be a DE in the 3-4 or in heavy goal line/short yardage packages in the 4-3. Similar size to Hatcher...and a pretty good athlete.
Ealy has the size to potentially play either side, and the most upside/athleticism. Missouri has also produced some very good D-Linemen recently with guys like Smith and Richardson. Had 3.5 sacks while playing with Richardson and Sam in 2012...but improved to 9.5 sacks in 2013.
While Murphy might not be as 'quick twitch' as others, he possesses enough athleticism to have thrived as a 3-4 OLB in Stanford's scheme at 6-6/260+lbs...while facing some pretty good athletes from Oregon, SC, etc. He also lined up with his hand in the dirt. Perhaps Murphy could be had following a trade down similar to last year?
