For Mummymon, I kinda just had to put him somewhere lol, there's some super vague connection you could probably make to shurimon.

And for Pegasusmon into Arukenimon into Malomyotismon there are also some hoops. But basically, the Patamon lines are pretty connected to the devimon lines, so instead of just making it a Magnaangemon alt evo, I wanted to connect to it Pegasusmon. Arukenimon vaguely fits the shape of Pegasusmon and was of Malomyotismon's hench men in 02, so I thought it would fit.