As we digest all the Pro Days and shuttle times and vertical jumps, it’s easy to forget Trent Richardson.

In fact, the Browns and Colts have already forgotten. The former Alabama running back signed a 2-year contract with Oakland, which isn’t necessarily the express path to glory.

Richardson was the highest-drafted running back in six years when Cleveland took him with its third pick in 2012. He was the top pick in the draft who was not a quarterback.

And why not? He had played on a national championship team at Alabama, ran the 40 in 4.48 seconds at his own personal Pro Day, and seemed ready to handle the NFL’s plug-and-play position.

But Richardson was hurt during his first training camp. He did recover to have three 100-yard games and wound up with 950 yards in his rookie season. Two games in 2013, the Browns dealt him to Indianapolis for a first-round draft pick in 2014.

That seemed perfect because Richardson could play off quarterback Andrew Luck. Instead, he only lasted through the end of last season, when Richardson was waived. He didn’t even play in the Colts’ two playoff games.

Richardson lost his job to Donald Brown in 2013 and to Dan Herron in 2014. In his final two games of the regular season he gained 12 yards on eight carries, and he scored three touchdowns, without a 100-yard game, all year.

For his career he has averaged 3.31 yards per carry. He never has had a rushing play of more than 27 yards.

Having operated in Alabama’s NFL-influenced offense, Richardson should have been able to pass-protect. He also should have learned to read holes opened by Alabama’s powerful offensive line,but maybe that was the problem. Maybe the talent around him made him look deceptively good.

Of the 2012 first-rounders, six have made the Pro Bowl, but Robert Griffin III and Matt Kalil have had hard times since. Justin Blackmon was the No. 5 pick, with off-the-field questions that weren’t answered positively — and he’s been suspended indefinitely for violating the league’s substance abuse policy since 2013.

The Browns made a mistake on Trent Richardson, but only because they had the first chance. Moral: There are safeties, in the draft, but no safe picks.