By Brian Straus Slonina may well be the next great U.S. GK, and he has visions of becoming the best in the world. However it pans out, the teenage, Chelsea-bound prospect remains resolute. BRIDGEVIEW, Ill.—It’s a story that’s been shared in snippets or fragments over the past year or so, but it’s worth highlighting here because of what it might become. If (or when) Gabriel Slonina is the next iconic American goalkeeper—if he achieves his ambition and becomes the very best in the world—then what happened on I-290 in August 2021 is going to evolve from incident to allegory, to something resembli…