Viscous can pick up the urn while using his ultimate and deliver it in 20 seconds or less

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With careful maneuvering, viscous can trigger his ult before he approaches the urn and rebound off the wall to pick it up before leaving the area. With some extra jumps towards nearby vents, this allows him to deliver the urn uncontested as it is impossible for normal characters to intercept him before he reaches the delivery spot.

Contesting this is impossible. By the time everyone realizes whats happening, he's already halfway there. By the time your team gets to the delivery spot, he's already cleared the deposit souls.