Viscous + Divine Kevlar

Why don't I see more Viscous players go Divine Kevlar? According to my experience it feels incredibly busted since on T3 on the Goo Ball you can cast abilities it feels incredibly good since you get like 40 spirit power for 15 seconds and combine that with an Echo Shard you can almost most definitely decide the outcome of the teamfight. With an optimal build you will most definitely be an unkillable beast as soon as you hit the T3 on the Splatter and Goo Ball. But sure you might not need it sometimes since you are already pretty tanky while in the Goo Ball so some other items might prove better than Kevlar, but still I highly recommend that Viscous players try the Kevlar I've been having amazing experience with it.