I wonder how much difference goal kicking makes. I'm just thinking aloud here, no conclusions.
Moses kicks 64% for his career, which is about as bad as you can get for a regular kicker. 80% might be the benchmark, but it's a high one - very few players have ever kicked 80% for a single season. So let's say 75% is a more realistic expectation.
What this means is that Moses is missing one goal in 10 that a first-rate kicker would get. Let's say a decent team is getting five shots a game (the Tigers averaged almost exactly 20 points a game in 2016), at which point having a Moses-level kicker is costing exactly one kick every two games relative to the 75% kicker - or one point a game.
I'm not sure what all this means, except to say that even if Rankin was a 75% kicker and Moses can't improve on 64% it's certainly not cut and dried that it's worth running out a dud winger just to improve the goal kicking to the tune of a success every other week.