Not a troll post - which "piece" are we away from, that could be had realistically for the Spurs, and would put them into actual contention? From the rest of your post, I gather it'd be a C, to displace Jakob into the bench... So which big could the Spurs land, that would make them literal contenders? To be honest, I have my reservations that even someone like Embiid would be insufficient for the Spurs to contend for real. Or well, maybe Embiid does it just because he's so good, put Jokic in that bag as well, maybe even AD.... None of which will be had by the Spurs. So who else is there?
Most times, teams who are "one injury away from really sucking" are hardly also "one piece away from contention", unless that piece is a hypothetical All-NBA player coming in mercenary-style, á la Nephew, tbh.