I'm a long time Ravens fan & follow the team closely, if ESPN projected Willis to be a starter it was a mistake or an oversight on their part.
He was signed as an UDFA to be a depth guy in our system, the Ravens have Brandon Williams, Willie Henry at 3-tech DT & Chris Wormley/Zach Sieler at 5-tech DE ahead of him, plus drafted another DT Daylon Mack in the 5th round (he's a NT but can play 3-tech as well).
Unfortunately he hasn't played any snaps yet in preseason because he's been dealing with a calf injury for most of training camp.
He may not make the cut after the 4th preseason game tomorrow, but he could still sign on as a Practice squad player or get a shot elsewhere.