The knock on the slight and slender Paul Richardson leading up to the 2014 draft was the big potential for injury in the NFL.

Turns out that was a well-founded concern, because Richardson just has not been able to stay healthy. He didn’t get much action until late in his rookie year, and then he tore his ACL in a playoff game against Carolina. That and a hamstring injury burned almost his entire 2015 season, and he didn’t do much last year until Tyler Lockett was injured late.

When he has played, he has shown a knack for making great plays. He did it again in the preseason opener Sunday — diving to catch a 25-yard pass from Russell Wilson. But he also suffered a sprained shoulder on the play and will be out at least a couple of weeks.

It was a rough blow for Richardson, who had a chance to bump Jermaine Kearse as the No. 3 receiver behind Doug Baldwin and Lockett. Now, Richardson seemingly will revert to fighting off other guys for the No. 4 spot.

Kasen Williams, who has had his own injury issues, took full advantage of Richardson’s early departure. Williams caught all four passes thrown his way, gaining 119 yards. Every one of them was a tough catch — contested or diving or twisting. If he can stay healthy, Williams should make a big run against a crowded receiver field.

Here’s what we saw at each position in the Seahawks’ 48-17 win over the Chargers:

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