Just throwing out an idea here, not the delete them one which is my preference.
Have these data-CONS act like leadership mods with similar upgrades like regular mods with some very minor abilities. Only leaders can have them and they can require teams be certain relic levels as is. Just an idea but make them much less impactful and just an additional bonus with about the same rarity of 6* mod upgrade materials.
Basically a 7th mod but for leaders only and impact the team as is up big down scale of numbers.