This thread got
awesome.
Heh, ambitious for Vanillaware? You should read up on their history, because that was a company that was constantly on the brink, with Kamitani admitting that he would put them at the verge of bankruptcy with each project they undertook, and the initiative to split teams up was actually to create a more efficient/smarter development process for the company.
You can read about that particular tidbit
here:
Essentially, a project of Odin Sphere Leifthrasir's scale would definitely still be adaptable to the "two lines" tactic, and Kamitani himself felt he had to apologize for throwing the Leifthrasir project onto director Kentaro Ohnishi, which means Kamitani was doing his own thing instead (i.e. 13 Sentinels).