@Neil Arthur Hotep
Maybe, I don't know. I'm not an english speaker, but to me, it seems that there are three major points with Blaze of Glory:
The conditional: If a friendly Stormcast Eternal model is slain...
(The trigger that allows you to do the action, ability, whatever...)
The time when it happens: Before removing that model from play...
(When you can do that action, ability, whatever...)
The effect: pick 1 enemy unit within 1"..
Same with Cycle of Storms:
The conditional: If a friendly Stormcast Eternal model is slain...
(The trigger that allows you to do the action, ability,whatever...)
The time when it happens: Once per turn,... and instead of removing that model from play...
(When you can do that action, ability, whatever...; in that case, it's when you remove models from play)
The effect: ...instead of removing that model from play you can heal 1 wound...
As @Reinholt explained a lot better than me (thx!), point (2) from Cycle of the Storms seems to not be compatible with point 2 of Blaze of Glory.