I think Agholor has been hurt a lot by Mac. He's the one guy I feel like would have been a lot better with Cam. For all his flaws Cam was pretty good at the deep ball on the rare occasions he threw it. Agholor has had a couple plays where he'd have had big gains (and probably TDs) if the QB puts it out where he can run onto it, and Mac for various reasons couldn't. Cam I think gives him a better chance, whether just from getting a better throw off, or by escaping the rush then making the throw.
Mac is definitely better for all our possession type WRs, like Jacoby, and the RBs but he's a bad fit to me with Agholor who wants to get 3-4 targets a week that are 20+ down the field to be effective. He needs a QB who is gonna get the ball out deep and let him run to it.
Honestly I agree that Cam might be better in being able to survive longer on some of those place, although I would note that there were multiple plays in this week's game where Mac casually sidestepped an unblocked rusher and was then able to uncork it down the field, so he's really not terrible at managing to stay alive.
I'm really not as down on Mac's ability to throw the ball deep, even though he has had almost zero success doing it so far in the regular season. I mean, I can pull up video of him in a Patriots uniform, nevermind at Alabama, dropping three beautiful deep balls down the field. They were all in the preseason, which, yeah, preseason, but the big difference between preseason and regular season in this case was that on two of those throws Mac had a clean pocket to work from. He's physically capable of doing it.
I did a bit of a quick comparison of QBs in terms of average time to throw and the rate at which they're pressured, and Jones is right there in the area with Tannehill and Cousins, i.e. the quintessential "QBs with high pressure rates and low times to throw." That's a really tough place for a rookie to be forced to be. (It's worth qualifying this with the fact that Cousins has had much better results on deep throws, and Tannehill only somewhat better results (in no small part because because of drops), and both have obviously been overall better than Jones when throwing 20+ yards downfield and in general, duh. Jones is not presently on their level.)