I do know having all three kills maindeck is amazing
I think this is largely a function of how well you know your metagame and how good you are with the deck. Cody used three win conditions because he's well known (and feared) in the NC meta. I've found that the better you get with the deck, the more you can just use ToA for the win. Obviously if you have a meta full of fish and Stax, Warrens and Tinker become better.
I think its redundant in a deck that already has so much draw.
I like having access to a little more disruption...
I think this is much more match-dependent. In general the deck wants mostly gas with a minimum of answers to deal with stuff like meddling mage, chalice, etc. That being said, half of the cards you list afterwards (Scrolls, FoF, Gifts), I would consider gas.
Recoup is another option
This is a route I've had a lot of success with. Cody doesn't like it because it makes the deck even more dependent on the graveyard. In the past this wasn't much of an issue since The first Gifts or Intuition would either sucker out the tormod's crypt or allow you to gain card advantage to win through another route. If leyline of the void becomes popular, the non-grave draw (thirst, gush, fof, scry, dconf) become more appealing.
I have been wanting to test Bargain
Bargain is interesting in this list. It's won me a lot of games just due to surprise value. As the format speeds up it tends to get clunkier, and although I love playing with it, I suspect it suffers from 'the danger of cool things'. I want to reiterate that the comment above is correct- definitely run at least 1 dark ritual, even if you don't pack bargain.
Regardless of the direction, this deck (like everything else) is going to have to think about a plan for dredge.dec. 4x Leyline in the board may be enough...it may not.
