Toughts:
Out of the jungle there is not enough money in an average game for him to build enough items to have good AP and have survivability.
As a solo top he would be shat on all early game, ths prolly not farming enough gold.
Cho can be a tanky AP solo top because he has a safe nuke, great sustain, and is naturally tanky, Udyr has to go in do deal any harrass and turtle stance can't compete with carnivore.
Out of the jungle there is not enough money in an average game for him to build enough items to have good AP and have survivability.
As a solo top he would be shat on all early game, ths prolly not farming enough gold.
Cho can be a tanky AP solo top because he has a safe nuke, great sustain, and is naturally tanky, Udyr has to go in do deal any harrass and turtle stance can't compete with carnivore.
Quoted:
You'd still have to go with attack speed for the phoenix proc and you'd get kited to death even worse...
^This.

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Pheonix stance would be doing a LOT of damage, and his shield would be very hard to get through.
On top of that, his low cooldowns make Lich Bane quite good.