Drafting is always key for almost any team outside of the biggest markets in LA and NY....And NY just has terrible management to go with it so that doesnt help lol
I'd say that drafting is key for any team. Every Lakers championship team in my lifetime has had a mix of draft picks, trades and free agent signings on their roster.
Having said that, larger market teams do have a bigger margin for error than smaller market teams because it's easier to lure FA's.