At one of Matt's solo shows, I personally asked him if he helped write "Tired of Sex" because I thought it sounded similar to the some of the songs by Rentals. He said no and that any similarity is due to the fact that him and Rivers were listening to a lot of the same music at the time.
Matt is the reason the first 2 albums were pure gold. If he isn't on this tour, it's not weezer. Period. Regardless of what the idiot naysayers say.