Secret History and Connection

[Arkadious]

So in Mistborn: Secret History, there is this part where Kelsier finds the fortress that the Ire are in and sticks his hand inside one of the stone's used to make it up. Upon doing so, Kelsier gains visions of the place the stone is from; he began thinking that green plants were normal, and a few seconds after even began to understand the language used by the Ire. That last part is similar to someone using a universal duralumin metalmind filled with connection, tapping it in a foreign land so that others can understand them and vice versa. However, even days after that, Kelsier is still able to understand them and the effects don't seem to have worn off.

Is it possible that Kelsier has gained some form of permanent connection to the Selish System, and so by extension to Devotion and Dominion? Furthermore, does that mean it is easier to gain connection to something as a cognitive shadow?

[Yata]

Probably yes he gained a Connection to the System (well if the Stone are from the Selish System at all) anyway this Connections will be really weak in a long term.

To say probably everyone is Connected to a some degree with almost all the Shards. Of course if you are in a System where the Shard invest into this Connection is by default magnitude Stronger than a foreign one (to say the greatest Alethi warlord is probably less connected to Dominion than an average Selish one...but it's still connected to the Shard.

The Connections are not an on-off switch, you could be Connected into a wide degree with something else.

About the hypotesis on the CS and their easier way to connect with something. Well it's possible, after all the CS is a being without a physical aspect (without a proper anchor someone could say) so they are more influenced by the Investiture they are affected and composed. But it's hard to say as for what we know, Kel could simply be affected by some sort of effect the IRE put in place on the palace and therefore it's not strictly related to Kel but instead to the Fortress