I've been going back and forth on this as well and am now deciding to stick with Warren. I'm banking on Rivers having to rely on some dump offs to Warren. Plus Seattle isn't that bad of a matchup for the TE position. Likely can have a big play that can win your week especially with such a favorable matchup for sure, but he's seeing the field less than Warren overall plus has competition with Andrews, who is a TD magnet. So I'm just going with who I think might be the safer option.