I previously calculated in a different post here the rate of "high" picks (generally considered to be the early, or 1st three, rounds) spent by this draft team on players under 5'11'' and compared that to the rate spent on very tall players, and then compared both those to the prevalence of actual NHLers in each of those size ranges.
IIRC, the Blues have spent about 5% of their picks in the top three rounds on players under 5'11'' under this draft team...a rate well below what I eyeballed most other teams to be around, and a rate that is also far lower than the actual percentage of NHLers who are under 5'11''. Going off memory, I believe that Schwartz and Fabbri are the only two picks who fit that bill over the studied period, and both came in at 5'10''. Any team that drafted three or more guys under 5'11'' in the first three rounds over that span probably has a higher percentage of picks spent on that height range than the Blues because the Blues had a pretty good chunk of picks over that span themselves. I'd wager they are comfortably within the bottom five teams in the league in that category.
Anyway, I really don't think it's a controversial stance to take to say that the current Blues organization has generally shied away from that population with high draft picks since there's ample objective and anecdotal evidence that support that statement. They've generally drafted well, regardless, but that's besides the point here since we're specifically discussing DeBrincat.
DeBrincat interviewed with 21 of 30 NHL teams at the combine, and IIRC the Blues weren't one of them. The Blues had two chances to draft him, and passed both times. I can't recall the Blues ever being connected in any way to him as an interested party by news report, insider speculation, factual inference (i.e. interviewing him), or anything else even semi-credible. Maybe that was all smoke-screen to hide legitimate interest, but that's a bold assumption considering they passed twice on him and they had to figure the chances of him making it to their next pick were virtually nonexistent.
I said it back during that draft season and I still believe it now: There's absolutely no concrete reason to believe that they would have valued him highly enough relative to the rest of the league to have any prayer of actually landing him in the draft, and the reason why is obviously his size.