See below in Bold;

so 300 000 was in cryptex hand ?

Yes, that is true plus is covered in the OP.

correction i have them just bought at 900
at least some  

This is good for you and BCF.

bittrex only has 1xx 000 in sells ,

They are becoming hard to get in quantity 'Rare'

 something that make think to an intentional dump
for a fast p @ 13000 sat

What you do with your coins is your business.

when a block explorer for wallet amount or richlist ?

I would not count on one anytime soon unless the BCF Community wants to obtain the Open Source code on Github and build one themselves. The BCFTeam is far to busy at this time.