Well,
because I want to have compromise suggestion as usual, so I added some about foresight for his pasive skill.
5) Armour of high elves
Elrond is able to see into the future and reveal the impending danger. He wears the armour of the high elves, which inspires elves on the battlefield, and leads them in order to prevent the future events .
Passive ability - bonus effect for friendly units
I think that he had or we will have 25 % armour for him, 25 % faster experience and armour for units or something like that
... but main thing for today:
I've finished some analysis concerning ability to ride a horse for heroes in correlation with cavalry units throughout all factions.
I think that after read it you will change point of view concerning Elrond and horse.
Firstly I've checked
good factions:
Rohan is the best cavalry factions from the good factions and even in the whole game.
They have five different cavalry units and six "horse heroes" (all heroes except of Merry).
Imladris is the second best cavalry units in the game.
They have two cavalry units in the fortress but they have only two horse heroes (Arwen and Glorfindel).
Gondor is the third - yes, they have two cavalry units as well, but one of them is not from the beginning but you can find them on the outpost, so it is little bit disadvantage, but in Gondor case - we can find there four heroes who are able to ride a horse (Gandy, Aragorn, Imrahil and Faramir).
Dwarves and Lorien have the same position. One cavalry unit and one hero with some pet (Dain and Thranduil).
Evil factions:The best cavalry factions for evil is definitely
Mordor - four ringwraiths and Gothmog with Mouth of Sauron ... so overall six heroes, but find cavalry units as a permanent unit is quite problematic. Morgul riders are limited, five ringwraiths is different story so that only Haradrim riders we have to take into account.
As a second will be
Misty Mountains - one cavalry unit but two heroes (Azog and Yazneg).
Isengard - one cavalry unit with Sharku.
And the same case is
Angmar with one cavalry unit and we can't forget on Witch king.
I have to say that I didn't work with beast units as Wargs without riders, Mumakils, bears etc. and witch elite cavalry units as well. I don't know if they really work as a cavalry and mainly criterium for cavarly was that there has to be at least rider and that such cavalry must be permanent.
Conclusions:Imladris is extremely undervalued - in comparison with Gondor there should be at least four heroes with ability
ride a horse.
And overall
only three elves in the whole game have such possibility.
So Elrond with horse really can solve this issue.