So about the end of the game.. I have a question. (Spoilers)

Sam mentions it early on when talking about the coma situation, I believe. Both siblings have the same implant, the private channel thing is Pathfinder only, though.

The power of sibling rivalry, of course.

if both siblings had the same implant what does Alec  tell SAM to  transfer on Habitat 7 ?

Ok, there's the private channel but there's also an integration with Ryder's physiology beyond even what other pathfinders have ( which is what allows Ryder Jr to resuscitate ) , so twin Ryder also has this? How come? Alec had the entire family hooked on Special SAM ?
Because that integration, SAM says that if Ryder dies, he/she/it also dies. Yet there is no mention of that regarding the twin.

Finally i always thought that integration is what allowed Ryder to interact with Remnant tech but maybe i was mistaken.

This is more confusing than Bioware rumors.

Also consider that SAM himself is changing/evolving throughout the game.  This is not quite exactly the same SAM as what Alec Senior transfered into Ryder at the beginning of the game.  SAM is continually learning through Ryder's experiences and part of that experience that Alec never had involved being a twin.  Also, SAM devises a special access to gain communication with the comatose twin... something that was normally outside of SAM's abilities initially.

Ryder also learns to use Remnant tech to some degree without SAM.  Some Angara (i.e. the ones on Havarl) learned how to work the security system at Mithrava without the aid of an AI.  We don't know what natural or "learned the hardway" abilities Archon is throwing into the mix.

This game, in part, is about changing... and learning new things... both the easy way and the hard way.

It is. Towards the end of the game.

Sure Cora could have become Pathfinder, just like Avitus becomes the Turian Pathfinder. As for passing the torch to one of the twins it has to do with the conclusion of the task Ryder Family Secrets. SAM explains it at the end of that quest otherwise it would have been Cora.

Ew. Enlightenment was definitely more the goal than exaltation.

The Ryder Family Secrets chain was pretty good. Whole lot gets revealed at it's end.

The entire series is full of space magic. People who use that as complaint have no idea what they are talking about.

Ignoring the obvious, universe making things like element zero and the mass effect, we also get pure space magic stuff like the Conduit the Cypher and the Thorian from ME1 on.

Though the Vaults are next level space magic

All of the pathfinder team had SAM implants, and Alec is the only pathfinder whose implant is modified. I don't think it was his intention for one of the twins to be the next in line, I honestly think Cora was the true second, but because her life was in danger he transferred pathfinder status to Ryder to save her.

I *think* the twins had modified implants because 

Space M a g i c^TM

i don't even know how the archon hijacked the ark, I LEFT PARKED THE DAMN THING IN THE NEXUS, WHERE'S APEX?, The escort fighters?!, what the shit?! did they come on tea time?

Somehow I get the feeling Alex Ryder would've really liked the synthesis ending.

Well, the Creative Director is Mac Walters...