Wow, well this thread blew up.

Regarding what I said about FC vs SB, I only mentioned DT because in a situation where DT is viable to be spammed it's godlike. Not many situations are considered viable to that extent these days however since SE has provided 0 relevance in content outside of VW.

CA's minimum recast time is 1:40 seconds. During that time it possible to cast DT w/o FC a maximum of 6 times (6.6 recurring). WIth 5% FC, you are able to cast DT 7 times (7.1 iirc). Now SB is an 8% increase in SC DMG. Let's be optimistic and assume BLU X's average Amorphic Spikes dmg is 2500 (it's not, but I'm only theory fighting.) your SB will be an additional +200 damage, assuming you can consistently get full darkness damage everytime (you won't). Thats nice.

However, DT has a higher average than this. Let's be pessimistic and say BLU X's average DT is 500 (it's not, but I'm only theory fighting). That extra DT you will be able to cast within 100 seconds will do more than your SB would and certainly in terms of DoT. Unless you're able to get an average 6.3k darkness' as your average.

Of course all of this really adds up to being as relevant as Easter Eggs at Christmas.