Don't get upset about Ayra

First of all, "50+ speed without much effort" is just absolutely wrong. Her base is 37. To get 50 speed you need her weapon bonus (40), +Spd nature (43), Life and Death (48) and Speed Seal Level 3 (51). How the fuck is that without much effort, that's an insane amount of Investment.
Not to mention this amount of investment is just stupid. 46 Speed is the tier of life and death mages that die when you look at them funny and absolutely unnecessary even on her with a speed-based special. Not to say getting a +Spd nature out of this banner is insanely unlikely. Realistically you will have a 45 Speed Ayra with 18 damage Astra.
Which yes, equals a 34 defense bonfire. That Ayra nearly eaches with her 30 defense, btw. Being 2cd is pretty much the only advantage her Astra has over existing specials.
And I do not know why people are so fond of low cooldowns in the first place. 99% of the time Regnal Astra activates on an attack that kills her opponent regardless since Ayra got quite convincing attack in the first place. The only times it matters is when you fight some squishier Lances that would otherwise survive. For the record, she can kill a Sharena, but already fails at killing an Ephraim.

You are right in that she outclasses prior sword lords. But the difference is not as great as people make it to be - like I said, she's just Ryoma with a bit more damage.

I could have sworn when I looked at all the exclusive units I missed Eldigan was one of them, but I suppose I could have been wrong. A bit relieving, one less unit I have to hope comes back in season

I see what you're saying about the red units too, but unless you know something about how the units are selected, I don't think it's true that it halves your chances at all. The appearance rate, let's round down to 3% for simplicity. To select Lachesis of the focus units is a 1/3 chance, so to select NOT Lach from the focus is 2/3, so that is the odds of choosing Ayra or Eldigan in a pool of 100 orbs is 3/100 * 2/3 = 6/300 or 2/100 = 2%

Now say we have 25 blue, green, red, and colorless orbs just for simplicity. The two focuses you want are both red, so the actual probability of getting them is
2 /25 then Ayra you have a 1/2 chance not because they're both reds but because they're both focus units. so Ayra would be 2/25 * 1/2 = 1/50 or 2% and Eldigan would be 2%. To get either would be 4%.

These are just some crude numbers, but I think you can see, you can weed almost all non-focus grabs by exclusively summoning reds, and that in turn increases your chances.

As for selecting Ayra or Eldigan, I think what the rng does is raffles to see if you get the 3% then raffles between the 3 to get one. I don't think it takes color into consideration when deciding which unit it gives you and I think it's decided the moment the 5 orbs show up on your screen.

I could be wrong, but if that were the case, two reds does not decrease the chance of getting any one focus unit.