it's not really out of the question, I'm 155lbs and I have booters and they are perfect stiffness, also depending on the price he gets it might be cheaper to get the booter and a stiffer (#6 would be best) tongue. If you can afford it you may want to get the Hot Doggers, probably the best boot they make for park with some cruising on the side, the #6 flex is soft enough that you wont get shin bang and can still move around easily but stiff enough that you wont fall over on bigger jumps, the active boot board absorbs impact to make landings smooth as butter, and the Pro Liner is exactly that - PRO! so warm and comfortable and with the heat molding you'll have your very own custom boot feeling.
This ALL assuming you've tried on the boots and KNOW they fit...if not, try them on first before buying. I usually set out an entire day to try on and pick a boot cause I try on several different style and brands before picking one (I don't have a bootfitter near me - that would make life easier). I finally found that Full Tilt fits me perfectly and now I don't have to spend as much time searching for new boots. Hope that helps.
