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tolkiengateway.net
In the original they seem not. At the Fall of Doriath the twin boys are 6 while Elwing is 3. So why she has all the Dior's heirlooms with her is unclear. We could of course change the seniority. But if we make them all be born later - to make Dior marry later compared to Turin's story - to have more time to establish Nimloth's character, then we have to adjust e.g. the Tuor's Gondolin timeline adding the additional years here and there accordingly. Otherwise we will get the stories desychronised against each other.
We must be carefull not to end up with Elwing too young to birth Elros and Elrond in time (532 when Elwing is 29 after 7 years marriage to Earendil - both Earendil and Elwing were 22 at their wedding - [so Elwing's pregnacy seem to take longer then both of her mother's Nimloth's were]. Were we to delay Dior's and Nimloth's wedding for 10 years to make more room to introduce Nimloth as a character Elwing would end up 19 at Elros' and Elrond's birth - and 12 at her own wedding! We surely do not want this?
That is the reason why delaying Dior's story against Turin's and Tuor's is not without dangers. Dior's and Nimloth's marriage is relatively short (9 years) and Dior dies very young (36 years old). There is little room to cut from Nimloth's and Dior's story if we wants them still to end up having 3 children. But we make their story start or take longer we delay the Fall of Doriath against the Gondolin timeline (Doriath is supossed to fall in 506 while Gondolin in 510).
What I mean is: we cannot just randomly add or cut years out of the story at completely random places or we might even end up with Elwing still a baby at the time of the 3rd Kinslaying (538 - Elwing should be 35 and Elros and Elrond 6). Which would bring trouble for the Earendil story and the End of the First Age.
We have to think through our timeline changes carefully in advance from now on in the story as the Fall of Doriath is within the reach of a human lifespan now. We are no longer in the comfortable part of the story when we worked with millenia and a century more or less did not matters much.
I am not saying we cannot make changes to the timeline - just saying we should plan them well in advance and keep track of them.
We have to check in the timeine whether there are times when nothing important happens to try to cut out years there and add in where too much happens in the original story for us to cover simultaniously - and then adjust the other plotlines accordingly so they still do fit together in the end.
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Another Ep 12 problem:
Beren's funeral after Beren's 1st death
- it takes time for Luthien to die of grief in the original story but I assume we do not wants to show her in despair next to his decomposing corpse. What happens to his 1st body? Where is it buried and according to which customs?