Finrod Felagund: An obviously well-loved King.

[BelegS]

Finrod Felagund: An obviously well-loved King.
The greatest of the Kings of his Generation. Thus Greater then Fingon and Meadhros
He was a pretty fine lover too, never forgetting his loved one sitting way back in Aman.

Behind this leaguer from the Sea to Eryd Luin the wide countries of Beleriand, west and east of Sirion, were held in this wise. Though Fingolfin of Hithlum was overlord of all the Noldor, Inglor, well-beloved of all Elves, became indeed the greatest prince in the land. For King Felagund he was in Nargothrond, whereas his brothers Angrod and Egnor were lords of Dorthonion and his vassals; and he had also a fort and place of battle in the north, in the wide pass between Eredwethrin and Dorthonion through which Sirion flowed south. There stood an isle amid the river, and upon it Inglor built a mighty watchtower: Minnas-tirith: and there, when Nargothrond was made, he set Orodreth as warden. But upon either side of Narog all the folk of either race that dwelt in the lands took him for their lord, as far south as the Mouths of Sirion, and from Nenning in the West to the borders of Doriath eastward. But in Eglarest, and west of Nenning to the Sea, CÃ*rdan the Shipwright |was lord, yet ever he was close in friendship with Nargothrond.

Thus perished Inglor Felagund son of Finrod, fairest and most beloved of the children of Finwë, and returned never again to Middle-earth. But it is said that released soon from Mandos, he went to Valinor and there dwells with Amárië.

But it is said that not until that hour had such cold thoughts ruled him; for indeed she whom he had loved was Amárië of the Vanyar, and she was not permitted to go with him into exile.

Two Quessies,

Question: By whom was Amárië restrained? By Vanyar? But if she really loved Finrod that she could have gone with him or joined the exiles? The statement implies that she didn’t refuse to go with Finrod due to her own will, and then who restrained her? Could it have been the Valar? But weren’t Valar not supposed to interfere in the matters of the Children? Wasn’t Amárië free to choose what she wanted for herself? Has Tolkien anywhere told the reason why she was restrained and by whom she was restrained?

With '[Felagund] dwells now in Valinor with Amárië' cf. QS I (V.300): 'But Inglor walks with Finrod his father among his kinsfolk in the light of the Blessed Realm, and it is not written that he has ever returned to Middle-earth.' In Version II (§199) it is said that 'released soon from Mandos, he went to Valinor and there dwells with Amárië.' It has been told in the annal for 102 (§109) that 'she whom [Felagund] had loved was Amárië of the Vanyar, and she was not permitted to go with him into exile.'

Note the above statement is the commentary of C.T in the Chapter the Grey Annals.

My Question is why was he released from Mandos soon? Was their any merit according to which Elves were released by Mandos? Can someone explain in detail the whole procedure of release from Mandos? So the elves that died heroic deaths saving others were released earlier because Mandos took pity at them? Finrod’s case is here, Glorifindel’s case is here? What are your thoughts?