Catutie, why are you calling such sketchy stuff the top tier? Scizor may still see significant play but with Garchomp leaving a lot of decks won't run much special energy and can walk all over it. Steelix might still be good, but with exploud gone its fire weakness hurts its tanking power.
Lostgar...we'll see. I think it's going to be a major deck, but it's going to sit in the tier 2/3 rogue spot.
Magnezone: Takes splash damage from everyone teching against Zekrom; fighting weakness will hurt with donchamp being the "obvious BDIF". Has a good matchup against Blastgatr.
What I feel is going to be top:
Donchamp: Donphan is an easy turn 2 attacker with a lot of HP, and sets damage on your own bench for Machamp Prime.
Blastgatr: 100 snipes and hits Donphan for weakness. Machamp is less of a problem because Machops/chokes can be sniped. Zekrom is a potential issue.
Zekrom: Fast. Turn 1 attacks for 120 are possible and even fairly likely with this deck. Donphan weakness gives it trouble, especially with its inability to OHKO through Donphan's body and resistance. Machamp comes out to make game over, if the game even goes that far; has to tech heavily to win this matchup.
I think those will be the top 3 as it stands, but the tiers will be close and tier 2 will be very wide, with Reuniclus variants, Emboar variants, Magnezone, and pretty much everything you've mentioned there making it. That said, none of the 3 decks mentioned above are a good match for the ones in your post, setting them a tier apart.