Not a bad idea actually, anyone who explores 5.2 is already most likely level 60 or very close to it. The last thing they need from solo crystals are the XP boosts, so an uncollected solo crystal won't be bad at all.
I suggest that if one is uncollected, the lesser solo crystals get replaced with the uncollected solo crystals. So that means we will have the standard solo crystal with the 4* boosts and sig stones, and the uncollected solo crystals with maybe a tier higher. Of course the rewarding system will have to be changed to make it balanced, but I think it'll be a neat idea.
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Add 5* arena boosts, champion boosts, health & attack boosts etc in greater solo crystal.
I suggest that if one is uncollected, the lesser solo crystals get replaced with the uncollected solo crystals. So that means we will have the standard solo crystal with the 4* boosts and sig stones, and the uncollected solo crystals with maybe a tier higher. Of course the rewarding system will have to be changed to make it balanced, but I think it'll be a neat idea.