FEB _can_ be faster than Stompy. That doesn't mean it _is_. Besides, Duel's Stompy is exceptionally fast, third turn kills aren't out of the question, and fourth turn without interference are commonplace.
As for the Weaver...
First of all, realize that Masticore is BAD in FEB. Period. BAD card. It's good ONLY if you cast it, and then it becomes bad if it dies. Imagine a Shapeshifter. You have a Masticore in your hand. Discard it, say, during your opponent's turn to make a 'Core. During your upkeep, your Masticore is GONE, because you just discarded something to it. I don't care if it's a Squee, you lost the 'Core for this turn. You don't get to attack with it. So, you can discard it on your turn, right? Sure, but then it's gone by your next turn, for the same reasons. Yay. One turn worth of Masticore isn't good. It _is_ possible to keep Masticore in play, but only if, during your opponent's turn, you discard a Squee to Survival, then bring it back during your upkeep. I don't think that's worth the cost, personally, since you're usually better off having a Sliver Queen in that situation anyways.
The Weaver actually has some neat interactions. First of all, it's a card to Survival for, so you'll often be able to cover it if it becomes a liability. But if you Survival it away and then play a Shapeshifter, you get a 3/3 Fogging 'Shifter - That KEEPS the +1/+1 counters even if you change creatures! That's _really_ good. Survival up a Weaver and put it in play. Transfer one of it's counters to a Shapeshifter before it dies. Bounce a 'Shifter to replay it as a +1/+1 counter machine. Etc...