I think Larry always had a burning ambition to be the CEO of men's tennis and he took the WTA job with that goal in mind. When Larry's proposal to combine the tours (under his leadership) was refused, and the ATP passed him over as a replacement for the floundering Etienne de Villiers, that's when Scott's days at the WTA became numbered, and he started looking for another job.
For the record, i think it would be a very bad idea to combine the tours as Scott proposed. As separate sports, the WTA plays a second fiddle to men's tennis, but it least it plays its OWN fiddle. The appeal of the combined mens-womens Grand Slams is that they are the exception rather than the rule. I don't see where a combined tour management would benefit the women's game.
For the record, i think it would be a very bad idea to combine the tours as Scott proposed. As separate sports, the WTA plays a second fiddle to men's tennis, but it least it plays its OWN fiddle. The appeal of the combined mens-womens Grand Slams is that they are the exception rather than the rule. I don't see where a combined tour management would benefit the women's game.