Only Richard has all three...

There were no reported sightings of the princes after late summer nearly fall 1483...
Henry defeated John in 1485. Either NO one waited on them for 2 years, or they weren't there to be waited upon.

I've also seen "why would John trigger like this?"...
There had been an attempted revolt among his subjects claiming it should be Edward's throne. It had just been put down, but John had a fright his nephews could be a weapon against him...

No more nephews, no problem.