That is pure speculation. I have never heard that theory before.That was due to the cast change. Sakai was going to go to Z'ha'dum and get brain wiped/altered. Everything we saw with Anna Sheridan would have been Sakai and possibly expected a few more appearances in seasons 2 and 3 as she came in from the Rim before they got that, but of course the whole O'hare thing happened.
And anyway, it doesn't matter... it was never shown or even hinted at onscreen.