I have never had any caps "knocked off" when I have removed or inserted SE/30 logic boards. But I used to be a service tech for the now defunct MicroAge so I know how to exercise care. But what I can say is that capacitor was surely "ripped off" the board rather than simply "knocked off." As such, I would take a magnifying glass and examine the traces. For indeed, I can say with no small amount of certainty that at the very least the pads on that cap were also ripped off, but probably also some of the traces as well.

Despite all this though, the logic board would not have caused your focus problem. And I define "out of focus" as "being blurry" or "not sharp." If that is how you define it as well, then my previous advice stands. Check the CRT yoke board and all analog circuitry.