I am not defending Jones as a perennial all Pro, and his injury is absolutely impacting his mobility and perhaps his ability to brace, throw and follow-through....not sure. I am only saying that the loss was not solely based on him. Defense not getting stops especially on 3rd and long, dropped passes, missed XP and FG's, not being able to pick up blitzes, etc. There are several areas in which execution has been lacking. That's all I am saying. I agree about the officiating as well, especially the phantom PI on 3rd that factored into a Texans TD.
Also not sure during a playoff chase is the time to throw in an untested QB that as you said, has challenges getting the ball downfield. Stil don't see Leonard as a better option than Jones. But who knows? Maybe his day is coming....