Sony Santa Monica Teasing Something

[Teeqoz]

Dr.Vita said:

aLkaLiNE said:

.....https://en.wikipedia.org/wiki/Sly_Cooper:_Thieves_in_Time

It is not really a main Sly Cooper game. 
Sly Cooper series was made by Sucker Punch and not Sanzaru Games, Sucker Punch makes the main games...
And it is called Sly Cooper: Thieves in Time and not Sly Cooper 4.

Wat.

It plays exactly like a main game, it's built in the same ways as the main games, the only things different are the fact that it doesn't have a number, and that a different dev made it. Is Ratchet & Clank A Crack in Time not a main game because it doesn't have a number, unlike R&C 1, 2 & 3? Are Halo 4 and 5 not main games because they were made by 343i instead of Bungie? Are none of the CoD games mainline because they both change devs each year and don't have numbers?