Container bots can get points on their own, assuming they're decent at their job.
They can push a tote into a scoring zone without a "tote manipulator"(possibly a stack of 2 straight from the human player). They can also have a driving alliance partner do this. They can then get litter from a human player, which is possible, as shown here.
https://www.youtube.com/watch?v=sH0Gv2w8l0E
Then they can stack that container on top of the crate(or stack of 2 crates). This 'stack' is worth 12 points, 18 points if its 2 totes high. You could conceivably do this 7 times in a qualification match(if you get all containers from middle(which I imagine you'd start doing in auto), which is an appreciable number of points, 84 or 126. Depending on the efficiency of a tote bot(and the efficiency of a container bot), this could be more points than a tote bot in a match. Their 'stack'(with 1 tote, container, and litter) is worth as much as a 6-high stack. With 2 totes, they're doing even better.