jon rahm’s 225 or so pounds don’t exactly taper along his 6-2 frame. Instead, they settle with an even thickness, leaving him with the natural ballast that has historically contributed to stick-and-ball genius. Not that there’s anything plodding about Rahm. Watching the Spaniard swing a driver is to be reminded that large land mammals often move with startling speed. ? Facially, Rahm (pronounced Rom) evokes a young Stallone, the strong bone structure softened by droopy lower eyelids, more reason the nickname Rahmbo will stick. Golfingly, the best comparisons might be the chunky, explosive, persimmon-drieminded that large land mammals often move with startling speed. ? Facially, Rahm (pronounced Rom) evokes a young Stallone, the strong bone structure softened by droopy lower eyelids, more reason the nickname Rahmbo will stick. Golfingly, the…