Board Thread:Questions and Answers/@comment-32612505-20170901090206/@comment-33728484-20170901113311

Even if you wanted to prioritize Broly, you'd get Cooler to SA10 eventually, so the answer can only be: bottom right path. Elder Kais are quite rare, but not as rare as some people think. I had only 4 Elder Kais when I got my Cooler the other day, and he's already at SA9...

However, Cooler has better stats, better link skills (which make him even stronger), a better passive skill, and can even greatly lower the enemy's defense. He's the leader and the most important card in that team, so I'm pretty sure Broly can wait.