If One really wants to get Creative, use the Lam Plates AND the Twin...for a 3-color or even a 4-color bait.
Having the Twin also gives You more Capacity for shooting Single-color baits vs. a Large Injector, when shooting Thirsty Molds, whether Pro Molds or just High Capacity molds like the 7" Regular (non-Skinny) Carrot. The Do-It Twin's Blending Block is only 3.5" wide so it can be dipped into a single Cup or small Pot to draw a single color. If You're shooting several molds in single-color, Do-it's Twin increases Your capacity vs. reloading another Injector or clearing the now-empty Injector You just shot with. There WILL come a day I will own one of Do-it's Twinjectors.
The Lam Plates are also killer for shooting Half-mold Baits, using just the Bait Half, not following-through shooting the other half...Carrots, Senkos, Glider, all make Killer Half-mold Leeches.
Side Note...I would love to see some of Do-it's current offerings available in a different Sprue/Injection Port/Runner Arrangment, where the Sprue feeds each Cavity individually, shot at the Nose of the Bait. My first request would be the 9" Ribbontail Worm, so I can shoot Lams that result in a Top/Bottom Color with the Curl of the Tail Up or Down.