As to your question, yes, you can question Locke's objectivity highly. Anybody who has watched this team's offense over the last 10 games (and all season, really) would have to question Ty's coaching skill at some point. I mean, he's part of the puzzle, too. Not only has Locke NEVER questioned Ty, but he posts all this distracting stuff about what lineups might work which presupposes that the system is fine, it's the players not executing it.
Personally, I think Locke likes Ty and, as a matter of principle, doesn't want to call out the coach. But I also strongly believe he knows where his bread is buttered and consequently is following marching orders not ever putting Ty under the microscope.