I don't think he's *exactly* like Gallifrey - it's just a fun pet theory that I like to play with - but I really don't think he has endless power, either - A lot of 'life' and 'energy', but the only 'power' he seems to have is raw stuff and the inability to die and healing. Though I could be reading you wrong there.
And we've got some evidence that he's changing. I mean 1-) he keeps marks until he's dead or some time after injury (Cyberwoman and that bruise), 2-) he's aging, 3-) ultimately he turns into the freaking face of BOE. Even if you ignore that last thing - he's changing in some ways, and as for destroyed. Dunno. I'd be surprised if he was completely incapable of being destroyed. I don't think the Master or Doctor knows how, but I'm guessing there's a way.
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And we've got some evidence that he's changing. I mean 1-) he keeps marks until he's dead or some time after injury (Cyberwoman and that bruise), 2-) he's aging, 3-) ultimately he turns into the freaking face of BOE. Even if you ignore that last thing - he's changing in some ways, and as for destroyed. Dunno. I'd be surprised if he was completely incapable of being destroyed. I don't think the Master or Doctor knows how, but I'm guessing there's a way.