No, as said before if Ulloa is top scorer, Brighton are more likely to win the league. Therefore the odds are slightly different and you can't just multiply them. There is a name for this but I can't remember it, 8ace will be able to help you out.
Correct, related contingency.
You could always ask SkyBet for a price on this
https://www.skybet.com/football/sky-bet-championship/event/15456944
They'd probably only offer you about 250/1 though.