WIggs with Leia and Lando is useful for P4, will win you with the mod challenge, and will let you get EP the next time he rolls around, and you can get all four F2P. Wiggs is not your problem, it is your answer. Rebels and Jedi will unlock a lot of the game, have a team of each.
In general a lot of people have this 1 team mentality. The Meta shifts and toons get reworked, having a deeper teams means you have a better chance to have a particular toon if they become useful. Sid is back in the game, a lot of us have had him gathering dust for almost a year, but now it's not a huge deal to get him up to fighting prowess.
I don't care what anyone says, a deep roster will get you so much further along in the game and allow you to win so many more of the events that pop up.