Trent Williams returns to the 49ers and is serving pancakes

“Demarcus has been awesome,” Purdy said. “Just having that veteran receiver in that receiving room and showing those guys what it’s like to be a vet receiver. He’s very smart. He’s come in, he’s learned the playbook — and not only that — he’s actually gone out every single day and just competed getting up and down with the ball and tracking the ball in and getting in and out of cuts. You could just tell he’s a seasoned vet.”

The 49ers want Robinson’s tutelage to rub off on their young wideouts, many of whom enjoyed shine yesterday with a couple veteran stalwarts sitting. Brandon Aiyuk, of course, is still rehabbing from ACL and MCL tears. And Jauan Jennings, a star of last week’s open OTA session, was seen in the weight room Wednesday but not on the practice field.

That meant more opportunities for rookies Jordan Watkins — “he’s balling, man,” Purdy said — and Isaiah Neyor, who flashed both a dazzling high and frustrating low on Wednesday. On one play, Neyor — who runs a 4.40 40-yard dash at 6-foot-4 and 218 pounds — blazed through grass with impressively long strides on a catch-and-run off a crosser. A little later, though, the undrafted free-agent couldn’t hang on to a deep pass delivered by 49ers backup quarterback Mac Jones.

A lack of consistency was Neyor’s biggest issue in college. He’s one of the most physically gifted rookies in the entire league, but he dropped eight passes over his time at Wyoming, Texas, and Nebraska.

But this is why the spring program exists. The 49ers are aiming to work out issues while integrating new players into their system before training camp comes calling in late July. It certainly isn’t fair to pass definitive judgment on young players such as Neyor, who’ve only been in the 49ers’ building for about a month.

It probably wouldn’t be wise to write off Jones, either — even though the veteran quarterback did miss high on a handful of throws Wednesday. Rookie cornerback Derrick Canteen intercepted one of those misfires, leading Kyle Shanahan to immediately approach the offensive huddle to provide Jones a couple of coaching points.

Last week, Shanahan said that Jones had spent his first couple months with the 49ers simply adapting to some of the team’s QB techniques — which are markedly different than those he used in stints with the New England Patriots and Jacksonville Jaguars.