While in general yes. But OL coach is the most complex position coach. Most OL coach gained experience at the college level or as a long tenure(5-10 years) as an assistant OL coach under a top OL coach.
Now look at LJP. He has had 2 years as an assistant OL coach under 2 different OL coaches before becoming an OL coach. Now go look at Scarnecchia's (OL coach from NE for years now retired). That guy coached OL starting in 1970 at small time colleges, didn't really become an full time NFL OL coach until 1999. Coached years of OL in college then started out in the NFL at lesser positions such at TE and special teams for years as well.
Flo bungled the O staff hiring. Never should have prompted LJP before getting an OC. The moment he did that it all but guaranteed an internal OC hire. Most good OC bring some of their guys and OL coach is a must because of scheme. Heck we hired Gailey out of retirement and he still brought in his guy at OL (Marshall).
I have warmed up to the OC and really don't want to have our guys learning a new O for the 4th time in 4 years. But LPJ needs to go can't do it now but in the off-season. The OL coaching has been brutal. We had 3 rookies start last year at times, everyone of them has regressed this year, coaching. Lots of discipline issues with penalties, again coaching. So many blown blocking assignments, way to often is 2 guys blocking one guy yet a guy goes unblocked to the QB, again coaching. That is 3 major areas were the OL coach has failed, development, discipline, and block scheme/assignments. Now LJP may someday be a good OL coach, but he is in way over his head at the moment. He needs to cut his teeth in college or under a top NFL OL coach for some time.