that's a good idea which i've never thought about doing. i can imagine it could work.
i did something similar with my tank a while ago where i respec'd in assualt to give me a better damage output.
89
@Captain Solaris
Guild of Extreme Heroes "Strength is in Unity"
Don't bother, if you want extra DEF take passives, much better than wasting it on additional powers that will drain endurance.
I meant after i got the passives 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
Maneuvers just adds 2.5% defense to your total defense, it doesn't boost every individual defense power (or it would be useless for builds without any defense-based powers)
Icelock - Ice/Storm Controller
Command Bot 1 - Bot/Traps MM
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Seems to be a lot of SR questions out there - regen so much easier 
. My Katana SR Scrapper hit 18 last night and I was thinknig into the future and wondered about Leadership and Maneuvers. Im just wondering whether it boosts your defense in total by 2.5% or whether it boosts every defence power by 2.5% Im doubtful but would be a nice boost given wot ED's done
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I could be wrong, but I am pretty certain it only boosts your total. But even small defence increases as you approach the 5% cap are very important.
But possibly not as good as a nice dollop of regen from Health.
There is no clear take this from the pool powers, all depends on what you already have and how it is slotted.
As for primaries, Divine Avalanche used in an attack chain can stack with your passives for Melee (and Slash M/R/A) defence. Not as useful for a SR as it is in other sets but nothing to be sniffed at.
Ii would not bother with the leadership pool, as i have always found SR to be toggle heavy and its only really once you get conserve power that you dont run out of end in the middle of a fight especially with only 3 slotted stamina.
MJ
Seems to be a lot of SR questions out there - regen so much easier
. My Katana SR Scrapper hit 18 last night and I was thinknig into the future and wondered about Leadership and Maneuvers. Im just wondering whether it boosts your defense in total by 2.5% or whether it boosts every defence power by 2.5% Im doubtful but would be a nice boost given wot ED's done
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor