Keeping in mind that we already have a cap of 50 on Might, rendering Cyclone's [Orb of Your Plan is Undone] impossible, the system involves higher Might expenditure on levelling up overall:

Godspeed system:
[indent]Level 5-6: 10 Might on Acts of Creation
Level 6-7: 12 Might " " " " " " " " "
Level 7-8: 14 Might " " " " " " " " "
Level 8-9: 16 Might " " " " " " " " "
Level 9-10: 18 Might " " " " " " " " "
Level 10-11: 20 Might " " " " " " " " "[/indent]

Mk.II system:
[indent]Level 5-10: 10 Might
Level 10-20: 15 Might
Level 20-35: 20 Might
Level 35-50: 25 Might
Level 50-100: 30 Might[/indent]

While there is the fact that the Godspeed system is indirect and pretty much 'free', the asking price is really in 'creativity' (literally, in-game, but also on part of the player). For a level 9 god like Gadar/Belru-Vowzra, actually coming up with things to spend 18 Might on to get to level 10 is going to be difficult.
In order to avoid Cyclone's 'hurrdurr I dump all on byg webin hurrdurr' we can also incorporate the 1-Might 'Hero Weapon' and 2-Might 'Divine Weapon' dichotomy Godspeed establishes. Weapons created before now can continue to exist as very powerful legendary weapons (in fact, stopping their production will ensure their value is not saturated further).

But I'm not especially passionate about this if the sentiment is against it - I just think it's a better system overall, and why shouldn't Mk.II benefit from the best in Divinus-game-tech?