Yes... take a look at the Minions who are even still just slightly shorter than the Sentinels. The Minions are height 6 figures.
There are still several 5-height figures that probably should be 4-height. Take a look at the Krav Maga Agents and compare them to the Shaolin Monks and Microcorp Agents, for example. (For my consideration I don't mind said figures staying at 5-height for issues of level drops and adjacency.)
But to my knowledge only the Sentinels have been acknowledged as incorrect at 5-height.