The Walking Dead 8 x 11: was the last scene inconsistent?

Last episode of the Walking Dead had an enjoyable scene between Negan and Eugene and good all walker deaths courtesy of Darryl and the Alexandria survivors, but is still lacking of something.

The Father Gabriel storyline makes no sense, not sure where are we going with that. Maggie keeping prisoners and wasting resources it is not that smart either because Negan is not exactly negotiating.

But mainly the last scene with Negan's plan to attack the Hilltop is not at all consistent with everything we know about the walkers and the virus. The main characters are constantly splashed with walker's blood and entrails, never speeding the turning process. The only thing that does this are walker bites.

Negan apparently is going to wound Rick's group and infect those wounds to turn them into walkers. But this never happens, people turn only after death and only bites are proven to eventually cause death, not contact with walker blood (including with open wounds).

Is Negan not fully aware of these because he has no intel from the CDC like Rick and his group? Is it a continuity mistake? One thing is to catapult walkers like Eugene suggested, another is what Negan proposed to his crew.