Ah well, I wasn't suggesting we should stop following him... I get withdrawl symptoms after a couple days! I just think that rankings shouldn't be a priority right now.
Regarding Sinner's strength training, they are indeed working him very hard, and he's already put on at least 8-12 pounds since the start of the year. Which, frankly, I find a bit perplexing... Now, I'm no expert, but is it really advisable to work so hard on bulking up a (very slim-built) kid when he still has a number of years to grow and fill out on his own? Wouldn't you want to focus mostly on cardio, movement, athletic skills and - of course - technique, and then worry about mass once he's about 20 or so?
As far as Cation's comment, he mentioned having seen him in Binghamton after being eliminated, and apparently he was training like crazy... many many hours every day. Hence his comment about "losing the joy of it" or whatever. But honestly, I'm pretty sure it's Jannik himself who wants to put in the work. He's not exactly your average Instagrammin' teenager. He seems 100% focused on tennis and has no other interests other than becoming... very good. However, as you say, they should definitely keep an eye on any possible red flags... But I trust he's in very good hands (Riccardo Piatti and his team - you just can't do any better than that in Italy).