There are a handful of hybrids on the M66 right now. From the look of it, it seems like the XD40’s are getting prepared to go back to Michael J. Quill.
Also, 7572 is on the M106 if anyone wants to catch it.
Casey Stengel could replace them easily if they wanted to. For example, once Kingsbridge receives electric buses, they could send buses over to Jamaica/Queens Village and then they can send their buses over to Casey Stengel. I’m not saying this will happen, but it’s a possibility.