San Antonio Spurs Power Forward: Thaddeus Young
After a slow initial start, Thaddeus Young was impressive in the last six games before Poeltl's return. Averaging 12.5 points, 5.2 rebounds, 4.7 assists, and 1.5 steals per game in those, he's been an immediate boost off the bench upon entering games.
The Spurs can utilize Young's accurate passing to keep opponents running with multiple back-screens and cuts to the basket -- something they've done more and more lately with Poeltl out of the lineup.
Young and Dejounte are also starting to develop nice chemistry in the pick and roll. Since both of them are terrific passers, that can also lead to open shots for the other guys on the court if the lane closes up.
Young's size and underrated defense also make him a must-play when San Antonio needs big stops down the stretch.
San Antonio Spurs Shooting Guard: Devin Vassell
Taking what would normally be Derrick White's spot, Devin Vassell should be a staple in the Spurs' closing rotation. He's already making a strong case for being a full-time starter while White hasn't been able to get much going offensively this season.
Coach Popovich likely won't have White on the bench with games on the line, but it might be time to start looking at that as an option if he's still unable to figure out how to score while sharing the court with Murray.
The double-edged sword of a White and Murray backcourt has been prevalent in the early goings. They're one of the best defensive backcourts in the league but are basically the same player no offense.
Devin Vassell is showing he can take on more of a scoring role while also playing defense just as well as White so far. He's also a guy that will do intangible things on both ends of the floor and leaves his fingerprints all over games.
It still might be too early to rule Derrick out of a closing lineup for good, but he needs to start making outside shots and show more aggressiveness offensively to prove he can succeed offensively despite not being the dominant ball-handler. Until then, Vassell might be the best option.