I thought about the palantari.....
But have you considered that they are very silmilar in there make-up to
the Silmarils?
The are both crystaline, shine from within.
One gives off light from the tree, the other the light from far away.
So, in truth, the same, '
technology' (for lack of a better word) was used to create both the
Palantiri & the Silmarils. Yes, there was a difference & in truth, the Palantiri must have been harder to make.
BTW: it's also mentioned in
the Silmarillion that
Feanor made the Palantiri:
'And other crystals he (Feanor) made also, wherein things far away could be seen small but clear...'
On Feanor's skill as a warrior, it's total speculation. Since he went & got himself killed in his first battle, his record indicates he wasn't very good, right?
As far as
Sauron being some weakling & not having the cunning of
Morgoth, well the history of
MIddle-earth doesn't bear that out at all.
In fact
Tolkien says in HoME, Volume 10 (love that volume!), 'Myth's Tranformed' page 394:
'Sauron was 'greater' effectively', in the 2nd Age than Morgoth at the end of the First (Age).
Why?
Because, though he was far smaller by natural stature, he had not yet fallen so low.
Eventually he (Sauron) also squandered his power (of being - author) in the endeavor to gain control over others. But he was not obliged to expend so much of himself.
To gain domination over
Arda Morgoth had to let most of his being pass into the physical constistuents of the Earth..... Morgoth at the time of the War of the Jewels had become permanently 'incarnate': for this reason he was afraid, & waged war almost entirely by means of devices (raining down fire in the 4th Battle, pestilence), or of subordinates (Sauron, Gothmog,
Glaurung) & dominated
creatures (
orcs,
trolls,
Easterlings, werewolves,
dragons)'.
In other words, Morgoth had poured his power into other beings, no longer had it in himself, simply ruled as a tyrant & Sauron actually had more innate 'spiritual' power left in him than Morgoth did.
Does this mean Sauron could've taken over for Morgoth?
Probably no.
Morgoth gigantic size alone - Sauron was 'far smaller in natural stature' & Morgoth probably kept things in line through mere intimidation of how he looked & who he had been alone - there was no reason for anyone to know overtly that his power was dissapated was there?