Nope. I'll say that Elena's Vicent's unknowing lover. But Tseng knew about that, he fired Vincent and asked Hojo to avenge him. You should accept this theory, Tseng's the kind that will do anything just to achieve his goals, eg he hunted for Aeris in years, destroyed Sector 7 to get Tifa, waahh, I think Don Corneo is under him too. Don Corneo sacrifices a girl per day, the rest are for Tseng. Both of them are *^#@***

Tifa will go with Johnny if Cloud dumps her becasue of Aeris. Also, Rude maybe plays a role in this complicated relationship, since he've confessed that he love Tifa..... Rude must be very faithful, I guess he'll say sth like," it's my job to love/marry/protect Tifa." wow,he acts cool and talks so little, but you can tell that he's not lying... sth good about the loners.