I think that you underestimate Durham Smythe's catching ability. He's not "just a blocker". When least expected, he can make a good play - eg last week's TD. Tua did well scrambling but Smythe deserves credit as well. He gets very few opportunities because the Dolphin offense is pretty loaded, but don't write him off. He's better than many realize.Gesicki is just a horrible fit in this offense.....I have said that on O TE is a major need next (outside OL). Gesicki can't come close to playing TE in this O. Smythe is just a solid blocker, but adds very little in the pass game, he has good hands but not athletic and a poor8sh route runner as well. The O has been great for the most part, but a legitimate TE would take it to a new level. With the attention Hill/Waddle get a top TE would feast on dumb downs after they clear out the safeties.
BTW - Agree that Mike Gesicki is not a good fit for the Offense for the future, but this may be precisely the game when MG's height and speed make some plays.