Is it worth spending training right now?

Training is a fairly scarce resource this early on, although its not too hard to accrue if you just play the game. Is it worth it to buy the 525 training pack where you get 77x3 players and some tokens? Or should I just hold

I'm holding or selling everything...I have found it fairly easy to build a good enough team to beat all the challenges / solos...online is another story, but...good enough.  I staff my team with mostly BNDs and sell everything that will go for a good price...in a week or two most of these 85s will be half what they are right now.