HTC Desire :: Contacts Synchronization - How It Really Works?

I have 3 accounts in my HTC Desire. Gmail (or should I call this Google?) - the automatically saved emails that GMAIL keeps when you write to a person.
Phone - which are the phone numbers saved in my phone and
Facebook - So when I go to people, I see that there's like 4 categories when I press MENU and VIEW: SIM(0) ; Google(296); Phone(731) and Facebook (460)

Ok, first weird thing is that even if I choose to View only my Phone contacts, on searches and when I write an SMS, the suggestions include their Gmail and Facebook entries too- which is quite confusing because the reason I hid them is I only want to send an SMS (yeah I know theres an option "Only contacts with phone number"). Is this really the case? Next weird thing is that: Since some of my Phone contacts are actually my Gmail and FB contacts as well, I linked them from the phone app (I clicked Link in the Menu and chose their respective contacts). Okay, so in the list, I see the name of my Phone contact and at the same time if I click on their names I see email and FB info as well (the FB profile pic shows! neat!).

However, I found out that when I try to click on Edit it still let me choose which contact I will edit, in this case: Google or Phone - I thought I linked you 2 already, so it follows that if I add an info, like, another number then it (the Phone app) should assign it to the name as a whole, right? Apparently, the Link command in Phone app only makes you "see" one name in the list- but in other processes still treats your contacts separately. Okay good- at least I know now. But When I try to Delete the contact in Phone it also deletes the Google contact but Facebook contact remains. Does it really treat them separately or as one- basically the problem is that users need to know how the Phone app actually does it's process of syncing. Or at least wouldn't it make sense, for the system to ASK you which account you would want to delete the same way it asked which one you wanted to edit (as my experience did above)? Something like "Do you wanna delete: Google, Phone or ALL?" (I know Facebook is a bit complicated so it's ok if Facebook contact editing and deletion is not totally synced for now).