Tier List Discussion - Which is the best Roamer?

Here is my Tier List for Roamer

Its on my analysis based on few points

1. Early phase skills
2. Initiate/protect/heal
3. Crowd Control
4. Function
5. Durability
6. Map opener
7. Scout / Information communication
8. Cooldown skills

And it will splitted into 5 group

S - Super useful especially teamfight
A - Most common to use
B - Still ok but havent have major impact
C - Kinda ok but not useful in late game
D - Seriously? What are u thinking?