I was going by the Ibeabuchi fight as the closest approximation of Tua's prime. Even that Tua loses a near shutout to Buster on his miracle night.
I define Peak Tyson as spanning from Berbick '86 to Spinks '88. That's 8 fights or 46 rounds, hardly what i'd call a "few moments".
That version of Douglas should be able to take a wide UD, but the version that fought Holyfield looses.
Douglas UD's Tua, it would a similar fight to the Tyson fight. Tysons forgot more than Tuas ever learnt Infact Tua did fight a similar fighter with a similar style and got schooled (in his prime), i think dudes name was Lennox something. If Tuas backpeddles like he did vs LL, then its UD for Buster, if he keeps coming forward, Tua's getting KTFO.