If the SP is present, you get BugFrags.
If the SP is not present, you don't.
(Simplicity is good.

Quote ()
NOTE: If you drop a level for whatever reason (usually Battlechips), you will NOT lose the upgrades associated with that level. They are already integrated into your Navi; dropping one level won't make them suddenly disappear.
Quote ()
--With a Cross, you can choose to adopt the CrossNavi's element/subtype while you have the Cross activated. You may also choose to NOT adopt the Cross's subtype, although the element change is required. Please note that this override only occurs during the Cross, and you must announce this change when you register your Cross.