I can’t speak for Bryan, but I teach a similar transition. First and foremost, people struggle with the fact that a jet is still an airplane, and can be treated as such. I spend a lot of time trying to get people to use basic instrument skills and understand what the flight instruments are telling them. And why when they’re at 15 or 20 degrees of pitch, they end up too slow when the target in the profile is 10 degrees for the proper speed. Stuff like that.
Same with twin time, the value is in understanding the principles involved and why we do what we do, so they can be applied to the jet (or not, as appropriate.) since most pilots haven’t had an engine failure in a twin, the muscle memory for controlling the airplane isn’t really any better at 100 hours of multi time than it is at 10 hours of multi time.