If anyone really wants to look at the actual difference between Newk and Folty, look no further than GB rates.
Folty has consistently induced ~40% GBs or less, while Newk is sitting at nearly 50% this year.
The reason being Newk gets huge ground out rates with his plus CU (68% for his career), while Folty doesn't have a single breaking pitch that induces even 40% GBs.
Due to the lack of GBs, Folty is much more HR prone than Newk (1.3 HR/9 vs 0.8 HR/9).
We already knew this. We already knew Newk had TOR stuff, and Folty had mediocre breaking pitches. This is not new information. It has nothing to do with some magical and unproven silly assertion that Newk misses in the zone less often than Folty.
What's concerning about Folty is the huge uptick in BB/9, from a career rate of 3.23 to 4.60 this year...rather inexplicably. He has historically had much better control than Newk, and now suddenly doesn't. That better control used to close the gap between Folty and Newk. Now that Folty's control is garbage just like Newk, he is a worse pitcher than Newk. It's clear and undeniable.
I'm guessing we see Folty tighten up his control closer to his career rates, and we see Newk's 0.58 HR/9 in 2018 regress a little closer to 1, and they end up being very similar "stuff #4s".