Art Kehoe did not suck. Every OL he coached got better until last year. He did a tremendous job with Feliciano and Wheeler who came in looking like they didn't belong in division 1 football. He did a great job with Henderson who played like crap as a true Freshman and became an outstanding pass blocker, went to the Bills as a seventh round draft choice and started over their first round draft choice from Alabama, Kouandjio. He had several OLs drafted. Last year he had to work with probably the least experienced OL in Miami history. One player, Isidora, had barely a season's worth of snaps. The rest of the roster had no snaps at all or less than a third of a seasons worth of snaps. OL is a unit where playing experience is critical both on an individual level and as a group. With the exception of Gaul, every OL played better in the second half of the season than the first. I have kept track of every play of every OL in every game against a FBS opponent for the last 8 years. Art Kehoe has never come close to sucking.
Kehoe underachieved here. Actually Henderson regressed under Kehoe. Stoutland had Henderson beasting as a true freshman. I don't know where you got your assessment. I still remember Henderson dominating Daquan Bowers (best DE in college during the 2010 season) as a true freshman. Kehoe also wasted the talents of Washington an all conference performer by playing him at tackle. He initially did the same with Feliciano who is naturally a guard. He did not make anyone better...
Henderson was terrible as a true Freshaman. He had the second worst season as a runblocker in the last 8 years behind only Bunche (2012). And he had the third worst season in the past 8 years as a pass blocker behind Rutledge (2008) and Pipho (2009).