Aye, I doubt he'll have issues restraining himself, knowing him. I started on my Daytona 955i, and the first cruiser I ever rode was my Rocket on the test drive haha.
I have a different opinion than most about starting bikes.
Personally I find the start on a 250/300/500 argument somewhat invalid. For myself, and I suspect for many riders who start later in life, throttle control isn't an issue. As military we are forced to take formal training before we are allowed to ride, so the basics are taught correctly.
Honestly, yes, on day one I did out and pin the throttle in 2nd gear on the Daytona all the way to redlin when I got to a wide open road. The sheer mind distorting terror gave me incredible respect for the right hand on the bike, that respect made **** sure I only used full power when I knew it was safe, and I will always have that ginger right have on a Liter bike, you kinda of have to lol.
My biggest challenge learning to ride was putting trust in the tires to hold when cranking the bike way over. Once I learned to do that it was game on. Body english, high corner entry speeds, threshold braking, hovering the rear tire while backing in, stoppies and wheelies are all skills that take time to develop and they take time whether you are on a 250 or 2300.