If you take the word "theories" out of your title and just leave it at misconceptions and this thread would still only be slightly amusing...

Maybe they wanted some subclasses to be better in some situations. I believe there was mention of certain enemies being weak or resistent to some elements. Sure, you can switch to a different element weapon, but you can also switch subclasses to use the full force of your abilities against particular enemies. The Defender and Sunsinger also seem more party oriented and may be preferred in certain strikes or raids. Of course, the subclasses are all powerful and fun to play as, depending on your playstyle. So we can't say any one is better than the other in the long run.

"Destiny allows you to freely swap your ability choices, but according to Green there comes a point when you can lock them in. This gives your Guardian benefits, such as a stat boost. At this point you get a copy of the same focus, but that copy levels up much faster, thus allowing experimentation." This is what I believe 3rd subclass spot is for

If we follow suit with themes to the T the hunter's void class would be support in some way. The warlocks arc would be some sort of melee cqc build. And the titan's solar would be some sort of ranged ability. I doubt of a third class on launch. But i could see maybe in a future expansion.

You can also swap subclasses for any give situation on the fly, you know.

1. i don't think many have chosen a subclass based on it being unlocked later. There are clear skill differences between the two and they would cater to different playstyles. That being said, there is so much of the second subclasses we have yet to experience ourselves, so it makes sense to be eager to play them. They also just so happen to be pretty powerful and/or useful when compared to some of the first subclasses ( such as bladedancer doing almost everything better than gunslinger, which has very few useful things) 2. It was confirmed long ago that we would get a copy of a subclass to mess with if we locked one. This spot most likely serves to hold the copy. Cant be certain on this, but i doubt we would see a 3rd subclass in the game at launch. Especially since we don't even unlock the 2nd one until 3/4 through to max level (not counting Light bonuses). 3. If they are put in, the 3rd subclasses would most definitely give each class the last form of light. It only makes sense to. 4. I doubt the hunter would get any sort of familiar, since their other abilities are suited for modifying their current equipment. Golden gun fills their hand-cannon with solar light, and bladedancer fills their knives with arclight. The last one might do something like cover their cloaks or armor in void light, allowing them to warp space around them and score criticals with each hit for the duration. It would most likely revolve around modifying their equipment, just like their other abilities. Similarly, Titans channel the light to their fists and disperse it, either in a powerful blast on the ground or a field of protective light. Warlocks fill themselves with light and channel massive amounts to their whole body, as with voidwalkers summoning huge masses of light from within them to hurl forwards, and sunsingers covering themselves with solar light to boost themselves greatly. There's a sort of pattern to their methods of super usage that they seem to follow. 5. kind of odd to call a misconception thread, considering a large portion of it is your own thoughts. Sorry, had to point it out.

they probably want to do the concept of final fantasy or wow for example where you need different classes to achieve victory only here they are not so important but when we gonna get to raids or hard strikes we will probably mix up our tactics with different subclasses because you can choose them back and forth i believe

good read man. i like your views and agree about the classes being equal but different, just because one is unlocked at level 15 doesnt make it superior. im pretty sure im going to be running gunslinger with the hunter.