There is the 197 coming up which could use the 60 reg as a part existing bid at the very least.
Arriva probably have enough DWs available elsewhere in the fleet to complete the 197's allocation. It just depends if Arriva are awarded any routes before the 197's tender.
Though Abellio (WL or BC), Go Ahead (Q, PM or C) and Stagecoach (KR) could also bid for the 197.
I touted Abellio for route 197 the other week. Totally irrelevant to London operations is that the route I ride most on my doorstep here is Stagecoach Manchester 197. So, it would feel intriguing to see a Stagecoach London 197.
It is just the original batch of 11 reg 19773-19784 that are now completed, with ex TL 10136-38/97/98 still needs to be refurbished as part of the 169's contract (Alongside one of the ex TL E400 of the 179 as well). Though 10137 hasn't been in service for two weeks now so that is presumably now away for refurbishment.