Does it really matter whether I vote since SunCal has submitted an alternative proposal to the city?

Yes, it matters whether you vote.

A YES vote will seal in the bad deal we have been examining here and place the city in an unfavorable negotiating position. A NO vote will make sure the playing field is leveled and the city has the same negotiating power as SunCal. It is crucial that the initiative is defeated before the city can begin negotiations.