If I recall correctly there has been a thread on the issue of transporters before. Somewhere. I'd like to see Vindicator being removed and the transportation ability given to another heavy gunship.
Assault transporterHow about a true assault-transporter? Give either Black Dawn or Krow the ability to transport units. Black Dawns main weapon and Krows Dgun can both be used to clear an area of defenses or units. After dropping their load they move out - the high reload time of both weapons perfectly complement with this unit role.
"Rush-ability"Although still allowing commander rushes both these units have a much higher cost and thus become less powerful in the early game. Black Dawns are just outside the very-efficient-rushables which tend to be in the 500m range. Good examples are Vindicator, Jack, Mace and Geo. From my experience the further away from this cost a tactic is the less rushable and thus common it is.
As proof a list of other rushables sorted by price.
Group of Pyros
Vindi with Gnatswarm
Reaper
Brawler
Black Dawn
Penetrator
Fusion
2-3 Prec bombers
DDM
Anni