Tavon Austin has long been one of my irrational NFL man-crushes, so it's a little hard to separate the reality here from my own bias.
But as I see it
-Jeff Fisher kills careers, full stop. Nick Foles, Sam Bradford, Case Keenum, Todd Gurley, Jared Goff - all of them looked like completely different players once Fisher was gone. Most of Austin's career has been spent in a Rams offense that virtually no player ever succeeded in. And despite that, he still had his moments. 10 TDs in 2015 between running, receiving, and returning, that's quite a feat.
-Austin got buried on the Rams because Gurley could do all the slick receiving work he could and more (seriously - Gurley is a hell of a receiver), they have an All-Pro returner in Pharoh Cooper, and despite his speed, Austin's not a lid lifter. McVay knew that. He traded a 2nd for a 1 year rental on Watkins and a 1st for a 1 year rental on Cooks to be his deep threats even with Austin on the roster. So Tavon was pretty much the odd man out.
-Despite that, I think we have a plan to use him the way he should be used. Linehan has long wanted another Lance Dunbar - he used Dunbar heavily whenever he was healthy, we always poked around those small shifty backs in draft season (this year it was Nyheim Hines, last year we were this close to drafting Donnell Pumphrey), and he even tried to shoehorn Ryan Switzer into that role. We don't always use our players very creatively, but I think Linehan legitimately has some plans for a Reggie Bush style receiving back.
-We're gonna feed Austin dumpoffs in the backfield, end-arounds, PRs, KRs, and let him do his thing in the open field. I don't think we're going to force him to be a WR, he's never succeeded at that and I don't think he's the kind of sharp route runner that Dak likes anyway. But he's going to get 5-10 touches a game in space, and he's proven he can crack some of those for scores when he gets the opportunity.
-I'm buying the hype, and I think he's going to have a role from Week 1 as a combination Lucky/Dunbar.