I think we’re just desperate full stop. I don’t think we’re desperate to tie him down per se.I've been saying for a little while now that I think Jenkins is even more promising than Tshiunza. He isn't nearly as athletic and won't get the highlight reel moments that Christ does but he's a proper lock who loves the set piece and the dog work. A lot of young locks that are his height (6'7) struggle to keep on weight but Jenkins is already a whisker off 120kg and looks very comfortable at that weight with plenty of room to add more on.
All that said, he (like Tshiunza IMO) isn't ready for international rugby yet and I can't really see him being ready for next year's World Cup either. Despite his being captain for Chiefs this past weekend, I don't think Jenkins is really anywhere close to pushing for our 1st choice 23 yet when everyone is fit. He's still fairly regularly playing for Exeter Uni. I know that Wales' lock stocks aren't great but there are still a fair few who are better than Jenkins is right now. To me this is just a case of Wales being desperate to tie down a young option who I don't think would ever consider playing for anyone but Wales anyway. And as you say, it just means that he's going to have to leave Chiefs sooner rather than later which (and I am biased) I think is definitely the best place for him to be.
I think they’re definitely considering him as a bolter for the WC. Whether he’s ready or not is another question, you’re probably right but fingers crossed he can add something in an area we lack. Definitely desperate, though, and that in itself should never be the main driver but I guess they’ll say it’s a risk worth taking given their potential. If Jenkins is captaining Exeter (I know it’s international and he’s not in the main 23 at the moment) at 19 that is impressive and suggests an exceptional mentality at that age which could be key in him making an impact even though he’s inexperienced.