The deck seems to be primarily focused with stacking destructive effects. For instance, tributing Najasho to Ballista Squad to blow up a card on the field, summoning out Diplo to nail a backrow card, and activating Evo-Price in the process, in order to detonate a third card. Cerato, while being a powerful beatstick, doesn't add to the destructive chain, so not that many are needed.
On top of that, drawing Cerato isn't as valuable as playing him from the deck via Najasho or Westlo, due to Cerato giving himself a stat-boost if brought out by his buddies. Due to that, 1-2 are needed at most. As for skills, I'd run either Dinosaur Kingdom, Dino Destruction, or Unstoppable Dino Power. Not too many other skills really fit the deck's theme.
Well that decks is quite meh.... if you dont open with enemy controller or balista squad you are pretty much fonished. You will just have a bunch of effectlesss dino and reptiles in your hand. This decks needs more tributing cards. Share the pain could be a good option.
Lagosucho here seems to be only to quickly get Najasho into the field with Lago's second effect (since you won't want to special summon Westlo or Lago, you want to Set them).
Which is....kind of a waste? Since there's only 3 targets in the deck. Also, Lago's first effect is meant to be combined with Evolsaur Vulcano for a quick Rank 4 Xyz.