Right now he is outclassed by everything he needs a lot of love so here are my ideas
1 His first ability stays With four Powers
:First vortex With lower range and duratio but Higher dps. Great for chocking doorframes.
:Second bastille also lower range but good duration and automatically pushes ennemies out of the field when exceeding limit of lifted ennemies.
:third a turret With high duration good range and medium health it needs more dps than His courrent first ability (wich sucks) its mode of fire would be automatic puncture dammage not to op but still good for point defence.
:Fourth could be a stun grenade youd need to hit the ennemie for Them to be open for finishers long enough duration for you to get to Them and melee them. Only stuns one at a Time.
His second ability a ammo/health Regen aoe maybe as big as garudas health Regen pool but shorter duration With similar health Regen.
his third could be a energy cost reduction activating it would give you x ammount of Time for you and allies With lower ability cost. Id give this ability low to medium range and good duration or huge range but low to medium duration
Finally His fourth id give him an exalted grenade launcher mainly blast dammage and everytime an ennemie dies from it they explode
with this kit he would keep all the abilities players like and are actually usefull he would also have team use and abilities would synergies somewhat together. Finally His grenadier / engineer concept stays true.