For FTP Era Crystal Spenders Who Cannot Take 6 Units Up To Level 115, The System Is Likely Working As Intended
See this post I made at the end of the last era about the MK VI Besh Ability Module bottleneck CG appears to have intentionally created to incentivize us to buy the episode pass: FTP WARNING: Those Who Use Crystals To Get Era Units to 5 Stars Might NOT Be Able To Obtain G13 Next Era : r/SWGalaxyOfHeroes.
The TLDR is that you seem to get only enough MK VI Besh Ability Modules to level all your era units to 105, even when you use crystals to take the era's legendary unit up to 5 stars. You can level some units past 105. And in fact, I think doing so is optimal strategy. But you do so at the expense of your other units. So choose wisely.
One thing I did not predict: You can buy MK VI Besh Ability Modules with crystals. This might actually be a change to the system. I only recall being able to purchase MK VI Besh Ability Modules with cash last era. But you would have to spend a lot of crystals to clear this bottleneck.