I would link 2(a) with 1, to say that the Professor WAS found on the Silver Devastation, it wasn't false memories. Perhaps he was found by Boe, and that's how Boe knew there was another Time Lord. Maybe Boe did the transforming, and the Master didn't plan to be a human at all - that would obviate the need for questions 2b and 3, too.
Maybe Boe changed him into a human and chucked him forward in time, without the Tardis? We know Tardises aren't the only way to travel in time. Maybe there's a Rift on the shores of the Silver Devastation. (What is it about this programme that makes me capitalise everything?)
As for the Master regenerating, I like the theory that his change from human and back to Time Lord "rebooted" him, because that would mean the Doctor was rebooted too.
I have no idea why Jack wants to see the Doctor so badly. I believe this is time for the "Because of Plot" answer. (The other answer for Who, of course, being "The Time War did it".)
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Maybe Boe changed him into a human and chucked him forward in time, without the Tardis? We know Tardises aren't the only way to travel in time. Maybe there's a Rift on the shores of the Silver Devastation. (What is it about this programme that makes me capitalise everything?)
As for the Master regenerating, I like the theory that his change from human and back to Time Lord "rebooted" him, because that would mean the Doctor was rebooted too.
I have no idea why Jack wants to see the Doctor so badly. I believe this is time for the "Because of Plot" answer. (The other answer for Who, of course, being "The Time War did it".)
Ooh, long comment. Interesting questions.