Do not remember the exact number but the statement(and calculation on it) was mine. However it was that 60% or more haste caps your energy (which you probably meant anyways).
But the thing is, if at 0 haste you only use every second global for TP/KS then you have a 9s rotation of BoK->KS->BoK->TP->Bok->TP -> Repeat, meaning 90 energy regenerated and 90 energy spent, which means spending exactly what you generate. (No matter which hastelevel this will always stay exactly the same)
BUT you will be:
- delaying KS for 1 second
- using no BoF
- using no T15 (could use the passive thou)
While the usual rotation (BoK->Filler->Filler) has a problem with haste scaling since you will loose BoKs, your suggestion wastes 1s KS and BoF. This will balance out at some hastelevel (the more haste, the better it gets to only use 1 filler) but in the end this is only a gain damage wise, while tanking is always better with 2 fillers (even at 50% haste)