Since SO has members with substantial numbers, i assume no.3 might be the factor that influence the price. Like @Kim said, if He couldn't control others account.
Actually, on latest CRM Trade, i got filled before Kim's alert at exact same price but still not fully filled as i intended. I got partial filled on IB and got fully filled on TW based on each account size. In the early days when i just joined SO, i also felt some frustration when see how quick the price got increased after Kim's alert and still to this day i missed a lot of Kim's alert or almost of it .
But with much knowledge or strategies that Kim and other mentors have been provided, i think there will be many opportunity to implement it on other tickers and yet we must be proactive to search and research the candidates. My portfolios are based on SO rationale but, yes, it exactly very different with SO Open Trades. Some months, mine could be worse and could be much better than SO performance.
Cheers.