If Synastry was changed to work on singletarget OGCDs too, then it'd affect Essential, Intersection and Exaltation (only passing along the healing, not the additional effects like the mit or shielding presumably), that'd still bump it from 'only used in sub60 content' to 'used pretty consistently in all content', they love their double hit tankbusters (P10S stomps/akh morn, P9S duality, P11S Dike, P12S Glaukopis if you don't immune it), so being able to hit the MT with an Essential, and have 40% of that transfer to the OT as well, would be very nice. Maybe shields could transfer too, at 40% rate, but I don't really think Exaltation's 10% mit effect should/needs to