I did some calculations between 2/3 and 3/3 incite and got to about 7,2%-7,8% damage increase on HS depending on crit. Correct me if i made any mistakes but it seems better then war academy.
Raidbuffed i have 9% crit (including battleshout/kings and +5% crit buff) rounding this up to 10% to make it easier. Average HS hit=5k average HS crit=10k. Grabbed those numbers from my latest WoL and rounded them a little to make it easier.
2/3 incite no hold the line, 20% HS crit: 15HS will have 3 crits and 2 free crits, total 12 hits 5 crits 51 secs, 110kdamage/51secs=2,16k dps
3/3 incite no hold the line, 25% HS crit: 4HS will have 1 crit and 1 free crit, total 3 hits 2 crits 15 secs, 35kdamage/15secs=2,33k dps
2,33/2,16=1,078 so a 7,8% damage increase
2/3 incite with hold the line, 30% HS crit: 10HS will have 3 crits and 2 free crits, total 7 hits 5 crits 35 secs, 85kdamage/35 secs=2,36k dps
3/3 incite with hold the line, 35% HS crit: 20HS will have 7 crits and 7 free crits, total 13 hits 14 crits 81 secs, 205kdamage/81 secs=2,53k dps
2,53/2,36=1,072 so a 7,2% damage increase
Edit:Misses will hit the incite procs twice since its a 2roll system, but the numbers are correct assuming no misses.