They just need to communicate more with each other so they can complement each other in their work at G5. Thus the remark that they need discipline, we don’t need a repeat of S10 or the arrogance of the team behind the last seasons of G4. But despite that, G5 is pretty good, primarily because of the characters - the MYM writers had fumbled quite a bit in the first episodes of C2.
Sunny needs a backbone, she is a bit too blue-eyed and naive despite the good character traits demonstrated in E3. Opaline should beat her up to give her a nudge towards what it means to be an inspiration to other ponies, there are underlying tendencies that should blossom for her to be Twilight’s successor. Sunny needs challenges and enemies, moreover she was an inspiration and a leader in the movie, this needs to be substantiated.
Opaline has become popular as a villain, so like Sunny, she should be a bit more than just a caricature of an evil pony, her background and motive can be built up to make her interesting and more dangerous in addition to being Sunny’s archenemy. She provides unimaginably great opportunities for future lore development about both the past and the future of G5, as there is much that is poorly known about the alicorns.
Misty may become the new member of the Mane 5, who may become the New Mane 6 in S2 of G5, but it is not certain, she may instead take a somewhat smaller role in the group like Spike and the Mane 6. She has become very popular because she is a pony in a gray area, her reluctance, eagerness, kindness and nervousness means that she aroused the interests of many.
The controversies surrounding the uncontrolled magic, the Unity Crystals and the problems with linking between the G4 and G5 because the “magic disappeared” problem is in the way, drags the G5 down. So far, the IDW team was the one who came up with the most logical and tolerable explanation for the Unity Crystal’s origin.
I think the “barrier” case is to “explain” the absence of the non-ponies of the MYM team. They could spare themselves that, and transform it to only apply to the crystals in question that Opaline was looking for. One should rather move this to the topic of Equestria’s collapse which IDW comics suggests was a very violent and recent event where the world that the Mane 6 had built completely unraveled and fell apart.
The old Discord was a big hit, many like the old and mournful draconequus as a memory of older times. The IDW team had to have a long series of side stories to cover the period when MYM is active, possibly because the end of the Discord Arc will happen at the same time as the finale of S1 of G5.
There is a strong possibility that a much bigger threat than Opaline and the mysterious alicorn civilization will be revealed in the final episode of MYM S1, as if our G4 heroines’ world were to be destroyed to create a new world, it should be the strongest, baddest and most dangerous enemy in the Ponykind’s history.
And it wasn’t Opaline. Twilight defeated her in the end and took her magic. Because it is highly unlikely that an alicorn as wild as Opaline would not have resisted as the Mane 6 will take away her magic.