I don’t have some agenda here, I think Splash was wonderfully done. You’re right that the AAs lost some movement over time (especially at the end there), but I’m talking about the original designs.
Look at the videos you posted. The Brer characters simply do not have the same degree of movement and animation as the America Sings AAs.
Unlike the America Sings critters, none of the Brer Bear AAs were made with articulated faces. The eyes don’t blink or move and the mouth doesn’t move. Bret Bear with the bees isn’t an animatronic at all.
Most of the Rabbit AAs are only animated at the head and one arm. Rabbit’s and Fox’s eyes are likewise static, and Fox’s mouth does the same rapid flapping open and close as the birds in the Tiki Room. The movement of the America Sings figures are far more fluid and lifelike, in my opinion.
To be clear, I think it’s fine—preferable, even—if some characters are less animated/articulated. I love the turtles or the frog fishing on the gator’s back with only his fishing hand moving.
TBA seems to do this well. Those A-1000 AAs are really amazing, but sometimes an animated figure rocking back and forth does what the scene needs.