Your best batsman bats #3, period. I really don't understand why he doesn't like it.
Nonsense, that's just an Aussie tradition that's been ingrained thanks to Bradman batting at #3 and Chappell constantly banging on about it because he can't think of anything else to add. Repeating it over and over again at the top of their voices doesn't make it true and I tear out what little hair I have left whenever I see the "Best batsman bats at #3" myth .
You can have the best batsman at #3 in Australia where the Kookaburra ball is useless after 10 overs and it never moves off the straight on those roads. In England, with a Dukes ball on greenish wickets, it's a different ball game.
If you look at batsmen who played primarily at one down, Trott was the last quality #3 for England. Who was the last one before him? Ted Dexter? Gower has a great record at #3 but he only played a quarter of his innings there. Wally Hammond has a terrific record at #3 but he batted at #4 more often.
"Your best batsman bats at #3" is not true in England and it never has been. Just because the Aussies say it, doesn't make it true.