Clemens is a good example to consider. He didn't actually start out hot last year but in mid-May reached a high-water mark of 1.034 OPS after 68 PA. The rest of his season, consisting of a more representative 318 PA, was a very pedestrian OPS of .649, in line with his pre-Minnesota track record of OPS .666. These hot streaks happen, and good for him, and they benefit the team - but don't bank further on them.
Gray's track record has no full season in the minors, where the pitching is easier to hit, with an OPS above .815, so the OPS this season of .979 at this writing (mid-game today) likewise looks unsustainable. His hot streak has happened and good for him, and it has benefitted the team - but don't bank further on it. (Enjoy it if this hot streak at the baseball craps table continues. I certainly will.)
There's no rush. He'll have the rest of the AAA season to figure out something if he can. I had hopes for him, but he's currently unplayable and with 13-man rosters you can't have someone with that tag on him. DFA tomorrow? (Hoping this is a reverse jinx for the rest of the game today, for his sake.)