Over time, their hard work paid off. They found more and more brain crystals that, in June's opinion, would work well if together.
But they focused on that only. Erik wanted for them to get powers that would give the clones an edge in the upcoming fights, but they basically had no time to find them.
There was an abundance of brain crystal powers that, if merged, would turn powerful, but it would also increase Erik's DNA point expenditure, and since they wouldn't be on par with Lightning Lord and other similar powers Erik had, they focused on finding the best brain crystals to make the invisibility.