You treat Reinforcements/Reserves as part of the Squad building, therefore Affinity will work. However, you must pay attention to the type of characters you can bring in with the Reinforcements/Reserves, ex: Garm specifically states they must be non-unique NR or Rebels; San Hill states they have to be Separatist; etc.

Of note: the characters brought in by Reinforcements/Reserves do not change factions, however, Affinity will change the character's faction, ex: Garm if used in a Rebel squad is now considered a Rebel (and not New Republic) for purposes of CEs and such.

I have four questions.

1: What do you do if when you get reinforcements you cant start them adjacent to the character because of other characters and or a wall or door?

2: Can you still use abilitys like light tutor or program target even if they join half way through?

3: If you have Nym and kazdan and for recon you get firstly a 5 do you get 30 points in droids then on the second roll you get a 15 do you get another 30 points or just one lot for the roll you choose?

4: can you bring back firstly non uniques that you have lost like you only have 2 mouse droids and both are killed, can you bring in a mouse droid using one of the dead ones or would you have to obtain a third mouse droid

The same for uniques. Can ypu bring back an Obi-wan if you've already lost an Obi-wan ( its impossible I know because all Obi-wan's are over 30 points ( Supreme Chancellor Palpatine ) but just from a hypothetical point of view )

Also if you loose a New Republic Luke or Rebal Obi-Wan can you bring back they're force spirits? ( if New Republic and Rebal had reserves )

I thought about it a bit more, and with regards to bringing in any version of a Unique that was previously defeated, the answer is definitely NO.

That Unique character is part of your squad (even if dead) for the entire skirmish.

So that leaves the question of using Light Tutor by a character that joins the squad later in the game...

Clarification on this one: Recon lets you make two rolls for Initiative, but you still only pick one and apply it.

Let's you have your above squad, and you roll init: Your opponent rolls a 10, you roll a 5 and a 12. You don't get to say, "I get Reserves from the 5, but I choose who goes first because of the 12." You pick one roll, and that is what you use for init. So in this case, you either get the Reserves, or you get to pick who goes first.

The same holds true if you roll a 5 and a 15 - you still pick one to be your final initiative roll.