Regarding the bolded, the funny part is, it does not even make much sense from a scientific training methodology (which is why it always had me shaking my head). I've raced with folks who did some more strength work in their off-season, and I myself have done some heavy lifting to improve power/punch years ago; done properly, there was no added weight. It was either weight neutral or lost weight. So unless his goal is bodybuilding, I don't know what this whole need to gain weight silliness was. As for early 20's weight gain because he is simply growing, ummmm, OK Team Quickstep, but please pick a reason and quit changing stories.
I enjoy watching Evenepoel race, but I remain to be convinced that Quickstep know how to support stage racing glory