Here's my guess.
Abramovich originally wanted to buy Spurs, but Levy et al refused to entertain the idea.
Abramovic settled for Chavski.
Deep down he loves Spurs
So he's building a 75k seater.
Then he'll leave Chavski to go bankrupt.
Spurs will sniff a good stadium in a good area and hey presto, we're the Earls Court Spurs in a shiny new Stadium courtesy of no 1 fan Roman Abramovic!