Everybody loves a bright, shiny new toy. New playthings are more fun because we haven’t played with them before. But that fun is just potential fun. Sometimes, that toy you get doesn’t provide nearly as much entertainment as you would like. There is an element of uncertainty ignored in lieu of newfound glee.

That can be a dangerous mistake to make when drafting rookies for your fantasy football team — particularly running backs. Yes, young rushers by and large are more explosive, dynamic, entertaining, fun. They also, most times, have an easier learning curve to adapt to the NFL game (with the exception of pass protection).

But those bonus factors don’t negative the underlining uncertainty, they only cloud it. The skill with which you are able to weigh that uncertainty against potential is what makes a good fantasy drafter.

First you must recognize not all these new RB toys are a part of the same play set. You don’t want to draft a Darth Vadar action figure if he is playing in a “Star Trek.” Take, for example, Christian McCaffrey.

Picked eighth overall by the Panthers, it is easy to envision him getting a healthy workload out of the backfield — after all, Jonathan Stewart is old and, well, dull. He provides a receiving option out of the backfield, which Carolina has lacked. At Stanford, he displayed the speed, elusiveness and vision you want in an NFL running back.

He is a versatile toy who can be used in a variety of ways. He is a Transformers doll, but he plays in an offense that is more of a hot-rod set. The Panthers don’t run an offense that highlights such skills. And if they did, his size and skillset are comparable to Cincinnati’s Giovani Bernard. Yeah, McCaffrey likely is a better version of that type of back, but that type of back isn’t normally used as a workhorse.

Considering where McCaffrey is often drafts — normally in the third round of PPR leagues), that is asking a lot of a non-workhorse, and of the Carolina coaches to alter their offense to cater to his talents.

Sure, it could happen. But assuming it does, eventually, it likely won’t be immediate, or even quick. The Madman likes him more in keeper or dynasty leagues than redrafts, at least at his current price.

Instead, if we’re looking for young RBs, Leonard Fournette is the obvious choice, as the expected bellcow in Jacksonville. But he is quite expensive as well, likely costing a late-second- or early third-round pick.

We like to look a little deeper. We are not adverse to tabbing Joe Mixon a few rounds later. But even he, with Jeremy Hill still there and Bernard expected to return after the season begins, might not get the carries many expect.

No, our favorites are even deeper. First, we look to the Redskins. They have talent in the passing game, but the backfield skills are pedestrian. Robert Kelley is this season’s Jeremy Langford — the start most likely to lose his job first. And that job likely will fall to Samaje Perine.

Similarly, but a bit more competitive, Kareem Hunt eventually should take over in Kansas City, though Spencer Ware and Charcandrick West likely will be harder to unseat than Kelley in Washington.

When you’re playing this fantasy game, toy around with as little uncertainty as you can. Don’t buy a toy that doesn’t fit the set. Get guys who have the best chance of delivering the fun you’re so eagerly pursuing.