I don't think you can pin Cal's collapse on Tosh. Their D was 1st in the league in most stats in 2010 & 2011 and the DL was the strength. The D held things together because they had no quarterback. If Cal had Price instead of Maynard they would have been a 8-10 win team those years.
Fact is, Tosh is an excellent recruiter...
A few years ago he stole Shaq and Vatuvei at the last minute. Yes Vatuvei is no longer but he was a guy that USC wanted. Last year the DL class was very strong with Qualls, Mathis and Farria. Qualls and Mathis were offered by both UCLA and USC.
The previous DL recruiting was a dreckfest...getting Potoe, Tupou & Finau- 3 complete busts. Missing out on Scott Chricton & DeAndre Coleman.
The new coach will likely keep Tosh because of his recruiting prowess in CA. UW needs to rebuild its recruiting in-state badly....which makes Mora an interesting candidate. He could rebuild in-state recruiting quickly and combined with Tosh continue to recruit CA quite well.