Does he tend to come from the inside on his downswing?
Can't say -- it depends on the swing (flaws) of the two hypothetical players.
My good swing (it's not my only swing unfortunately) has me taking the club back on what feels like is a very "outside" line. It feels like I'm coming down from the outside and cutting across the ball or perhaps pulling it dead left. However, that's not what happens. When I can convince myself to trust it I knock it straight and far all day. Almost impossible to fade and often a slight draw. I never hook it or pull it. I never slice it. My mistakes are pushes and involve hanging back on my right side. Overall, it's the best and most repeatable swing I've ever had - by far.
Over this past year since I've been swinging this way and I've always thought it kinda weird. When I look at professionals I don't see them doing this. Now, I've not videoed my new swing so maybe what I'm feeling is not what I'm doing. Perhaps it's a great swing plane. To be honest, I don't want to video it or get "professional help" right now. It's working and I'm delighted with it. I just need to avoid slipping back to an inside path. That's when I suck.
I've sworn off analysis and technical feedback. It confuses the hell out of me. I don't want the 1.5 billion swing thoughts. However, it occurs to me that my (lack of) height has something to do with why this works for me and why I don't see Ernie Els or Fred Couples (my tempo heroes and tall men I believe) doing the same thing.