Verzbicas has to be at the top or within a couple of spots as far as combined cross/track accomplishments are concerned.
Let's look at the contenders -
In XC, Ritzenhein and Hulst (and Hunt) have world junior medals. Hulst won the whole shebang, but Ritz got his bronze in an obviously more difficult era. Ritz also has those FLCC wins against stiff competition, so he's probably the most accomplished in high school cross, although Hulst was 7th in the US senior race, so he was really, really tough in that discipline and can't be underestimated. Fernandez's 11th at world juniors might have required a better absolute performance than Hulst's victory way back when, but never winning FLCC really is a sore spot when considering his place among the greats. Thom Hunt, with a 2nd (to Hulst) at world juniors might have been as good as Fernandez in cross, but that's not likely. Lindgren, Pre, Virgin, Chapa, McChesney, Nelson - they all have to be up there, too, but there weren't national championships in high school cross in the early days, so it's only guesswork as to what these guys could have accomplished with major titles to fight for.
How about the track exploits? Webb and Ryun clearly accomplished more than Verzbicas has in the mile. Their results are pretty hard to argue with. A few people have run faster at 5,000 in high school than LV has. And those 10,000 marks - sub-29:00s from Chapa and Hulst - could Verzbicas do that if he tried?
So some might be arguably a little better in cross and there are some who are better at their niche track events, but as an all-arounder, Verzbicas might be the best high schooler in history. He's won virtually everything he's tried against high school competition - two FLCC titles, the big indoor triple, etc. He has the only sub-8:30 for 2 miles and is one of 5 sub-4:00 milers. He doesn't seem quite as good as Ritz in cross (but we don't really know that), but he's easily faster on the track. If Hulst won more XC honors and mixed it up with the top US senior men, LV can't be far behind (and maybe ahead), and that 8:29 makes Hulst's maxed-out 8:44 seem almost slow - never mind the 3:59, which Hulst and Ritz couldn't have run in their fantasies. He's behind Webb and Ryun in the mile, but way ahead in the 2 mile and much more accomplished in cross. He's done more in both XC and track than Fernandez did, at least as much as Rupp did in track, and definitely more than Rupp did in XC.
So who's really in the running for the hypothetical crown? It probably comes down to Verzbicas, Lindgren and Ritzenhein for most all-around high school achievements.
Who's probably eliminated from consideration? Rupp and Fernandez broke legendary track records, but they didn't win a FLCC title, let alone two. Webb might be close only because of that one 3:53 race - his next best mile was 3:59i, and he, too, never won a national XC title. Ditto Ryun, who wasn't as good in the longer stuff but actually accomplished more in the mile than Webb did - 3:59 (and 3:39, which is better) as a junior, 3:58 in a high school only race on Kansas dirt, and of course that little accomplishment where he beat the Olympic champion and ran a 3:55. But he was basically a half miler/miler only.
Who's left? Ritz has higher honors in XC than LV and he did run 13:44 in the US championships, so he has to be considered. Lindgren set records across the board that it took forever to beat, some of them on crappy tracks - even his mile was spectacular except when compared to Ryun and Webb - and he made the Olympics. But it's hard to say how good he really was in cross.
So my vote goes to Lindgren, Ritz and LV as your top 3 high school all-arounders in history (did I leave any obvious stud out?) - in what order, it's too hypothetical to say.