doing it the way the op has will cause an openreach engineer to frown.
It was the original openreach engineer who did the original run when my fibre was first installed. 
Which is exactly what MrSaffron, myself, and at least one other have described to you as the purpose of that IDC connection inside. To run a data extension cable.
So I suggest you stop being so arty-farty and thinking yourself clever than all of us - you through ignorance have undone a perfectly good installation and done yourself no good at all.
With luck, neither have you caused any degradation.
Assuming you have completely disconnected that engineer-installed extension, that is all you have achieved, with no benefit at the master socket.
If instead you are now connecting that extension to some other point for some purpose, I don't think you have at all compromised the setup. But without physically seeing the installation that's impossible to know.
Out of interest, did that extension have a filtered extension socket, or just a DSL one?
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. Sync 54999/14466Kbps @ 600m. BQMs -
IPv4 &
IPv6