umm... You must be underestimating the legendary super saiyan... Cause super perfect cell is an ant compared to the legendary super saiyan. And let's not even talk about mastered or the theoretical feasibility of other legendary super saiyan forms or the integration of god ki into the Lssj form.
Meh I somehow feel that if all novels just compared everything to Honghuang/Prehistoric power levels everything becomes much cleaner since those power levels literally state what level of influence on existence their realms have.