Could AD Off-Tank Nunu Top be legit?
So I was spectating a game because they had a Top Lane Nunu which I thought was quite curious. It became even more curious when I loaded into the Spectator Game and saw that he had started with a Doran's Blade. He started with Consume and got a quick level 2 off Gromp, recalled, grabbed 2 HP Potions and went to lane. He ended up with first blood as soon as he hit level 4 and he permaslowed the Enemy Irelia with (literally) free Snowballs from his Passive. He eventually backed with roughly 1700 gold, grabbed a second Doran's Blade and a Sheen, took Gromp, and then went back to lane. He got another kill (this time it was a lot quicker because of the Sheen Procs and the good scaling from the AP Ratio on E which he was maxing).
He built these items (in this order):
(He sold his Doran's blades and replaced them with Spectre's Cowl and Chainvest then finished Spirit Visage and then Thornmail)
By the late game he was just running at the Enemy Carries and ignoring all of the Enemy peel then consuming for like 1/5th of his Maximum Health on nearby minions. It was dumb. The AD Carry was permaslowed, couldn't damage the Nunu and his attack speed was stuck at about 0.75.
Is this legit or was the guy I was watching a god?
EDIT: Like, he was strong in Lane AND he was a mega tank in the late game from his Q buffs. And from his Consume on Gromp & Krugs 1% of 3500 HP (his Max HP) was ~35 so he was dealing 35 Magic Damage On-Hit with his Blood Boil permanently up so he had like 1.75 attack speed.