On the subject of early season sample sizes, by the way, Polanco's wRC+ is now 101 after a game where he went 2-2 with two walks. From the looks of it (I let my sub lapse because I cannot stand him), Biertempfel has an article up about him today, during which he didn't even get his line from last night correct (I saw a screenshot).
IMO it's too early to fully declare him back, but the signs are there and encouraging. The K% still needs to come down, simply because you have to imagine the BB% will come down a little bit, but even if he just gets it down a couple of ticks while not losing more than two or three on the BB% (right now it's 30.8 K% ad 20.5 BB%), that will play with the power.
I have a feeling that the power is about to heat up. He's shown patience that I don't think I've seen out of him before, and it's impressive since the results have been slow to come. There have been at least half a dozen ABs in the last handful of games where the old Polanco would have started pressing and offered at bad pitches, getting himself out of his swing, etc. This Polanco is not even really being fooled by strong pitchers in good pitcher's counts. I am optimistic. The only downside is that I think his arm is still going to leave a lot to be desired. Having the NL DH again I think would be nice in terms of more easily integrating Evans into the lineup going forward.
A last thought is that I guess the Alford/Fowler worry might be a little bit of a moot point given that the temporary experiment seems like it's going to need to be Reynolds to CF and Evans in LF. Once Hayes is back, I think you have to bat Moran-Evans-Polanco as the 4-5-6 guys. At that point Alford/Fowler is basically a defensive replacement and occasional starter, so rather than Goodwin or Oliva, I think it could open up the opportunity for Frazier to come back as an occasional 1B start and pinch hitter. That's how I'd draw it up, and with the tools + years of control, I'd just keep Alford around for that defensive replacement job and see if maybe he'll turn it around a little bit. I think he's a better defender than Fowler anyways.