I think you misinterpreted JJ's comment. I think the suggestion was that Owens not practice so hard so that he will avoid straining muscles in practice.
You are interpreting it as JJ saying that Owens is 75% and should be practicing, which seems to be (at least from yesterday's PC) different from the intended message.
No one from the team has said that Owens should be practicing. All that has been said is that the longer he misses practice, the harder it will be to integrate him into the offense.