trifecta
1 : a variation of the perfecta in which a bettor must select the first 3 finishers of a race in the correct order of finish in order to win — called also triple — compare SUPERFECTA herein
2 : TRIPLE 1b *achieved a show-business trifecta : a platinum record, a hit TV series, and an Oscar nomination*
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Trying to overload a common term to a local group's definition is not easy. Every time you talk about the (spurs) "trifecta", you're going to have to explain your trifecta to everybody else. ugh, hardly a effective project.
Trifecta usually means winning or achieving 3 things, not a triplet of people.
They've only been together 2 full seasons. If this Spurs season really does end at historic-for-Spurs 66-16 record and a 3rd Spurs le, then maybe they would merit some special term.