I'd normally agree, but Joshua (the founder) has been minimally involved for years outside of the patent lawsuits. With that mostly resolved (in Mycroft's favor), he's moving on to the next thing.

If you want to replace a founder sometimes we just push them aside to make the focus on a new qualified CEO to take the company to the next level. After awhile people get used to the founders not being highly involved and their departure becomes less of a shock.

Sure. I joined the company last year, and Joshua has mainly been busy appearing in court to fight the patent troll. With that fight effectively over, Joshua and Kris are focusing on something new (not sure what specifically).

Michael Lewis has been running the company for two years, so this resignation is more symbolic than anything.