Ryans is counting on Lassiter/Bullock to have big seasons. They should be fine with the Texans pass rush being one of the best in the league. Bullock has really impressed me with his range. His not being a good tackler is very overstated. Dude is very solid. There's a reason Caserio/Ryans traded up to get Bullock.
Put Stingley with Lassiter/Bullock and Petrie in the slot and the secondary should be much improved. If they can stay healthy they will be one of the best secondaries in the NFL, particularly with the pass rush the Texans are going to have. I've still got faith in Okudah being a decent CB when he gets healthy.