49ers spend first-round draft pick on defensive end Mykel Williams

SANTA CLARA – Step 1 in the 49ers’ defensive reboot finally came Thursday night, when their first-round draft pick brought in defensive end Mykel Williams from Georgia.

Then again, the first overall step came three months ago with the re-hiring of Robert Saleh as defensive coordinator.

Now, Saleh, thanks to general manager John Lynch and coach Kyle Shanahan, gets a major addition to a defensive front that got leveled by this offseason’s roster purge, which included last month’s release...