So looking at the black ops and marauder class ships to find out what makes those tech 2 of tech 1 ships so specialised and its how they are employed in the game but what possible role could the 3rd tier have.
Well because the marauder use’s a similar mods to the dreadnought clearly it is designed to sacrifice movement for more damage and defence becoming an entry level for the dreadnought class of ship.
Well because the black ops use’s a similar style of jumping groups of ships resorting to shock and awe tactics to that of a titan resorting to group play and co-ordination it would most likely be entry level to becoming a titan class of ship.
So that would leave the third battleship tech 2 to become an entry level for carrier sacrificing a number of high points and replacing its drone bay with a fighter bay due to fighter drones reworked maybe giving them the means to carry a low amount of fighter drones to be a entry level for carrier class of ship.
Also looking at there designs it looks as if they would be able to carry fighter drones even if its a low squadron but hey i am merely spit balling an idea here.