Colin Sahlman is an outstanding American talent. Arguably one of the better all-around US high school distance runners ever. A joy to watch, and a terrific competitor. He may very well end up vying for national and even global podiums in the years to come. But he's no Sebastian Coe. Not even close, as TheRealScotty hinted at above with Coe's list of WRs and Olympic medals.
Context matters. Colin is currently ranked 291st on the all-time 1,500m World Athletics site. His current 1:45.63 800 PR is tied for #5531 (no typo) on the all-time 800m list. When Coe smashed the 800m WR at age 22 in Oslo in 1:42.33, he became one of the few competitors to eclipse the former 800m record by more than one full second (along with Sydney Wooderson, Rudolf Harbig, and Peter Snell) for the last 100 years. To this day, Sebastian's other-worldly 1:41.73 WR accomplished two years later in 1981 has only been lowered (by David Rudisha) by a mere 0.82 seconds some 43 years later, despite all the advances in training methodologies & coaching, nutrition, shoe tec, track surfacing, and healthcare.
When Coe set a new mile WR at Oslo at age 22 (only 10 days after his first 800m record on the same track), he did so against one of the deepest mile fields in history at the time (the so-called 'Dream Mile', back when such races were broadcast in primetime to the American public) featuring such stars as then world-record holder John Walker, Steve Scott, Eamonn Coghlan, and Thomas Wessinghage, and toyed with them.
Coe later lowered his mile WR to a sterling 3:47.33 in 1981, but had to meanwhile fend off his countrymen Ovett and Cram for world-leading dominance (thus underscoring just how great all three runners were) during the first half of the 1980s.
It wouldn't surprise me if Sahlman ended up winning national titles and securing Olympic berths, but let's endeavor to keep his and other competitor's accomplishments in context when comparing them against the historical greats.