Having run through the video a few times, I believe a winning alliance will need two kinds of robots: one fast ringer capable of filling up the paired goals' posts as fast as possible, and a not-necessarily-as-fast enforcer capable of maintaining goal control. (An enforcer could be tasked with other things, such as descoring, but I'd mainly have it focus on keeping those goals safe.)
Of course, every team in FTC should be asking the magic question: "What would Simbotics do?" (Yes, this is a direct rip of
Professor Grady's wisdom--but I don't think the comparison is unfounded.)