Yes, you can pull them from shards. There are roughly 250 pullable non-void legos in the game, so in theory you'd need to pull about 750 legos, or about 15k yellow shards, to get all 3 non-voids, plus another 16 000 void shards to get Leo, although there was a boosted summon for him a few days ago.

Did your opponent have all 4 different turtles, or 4 total? Most people already have Mikey from the 7 day log in, and some people started finishing the Donatello frags yesterday.

It'd be *comparatively* easy to have gotten those 2 and pulled 2 dupes compared to pulling all 4, but i have no doubt there are at least a couple krakens who have done it.

Just looked at arena battles, they had all 4. My fav cartoon when I was little shame I missed half this fusion. 

actually, it wouldn't. mikey and donnie are both on the 'can't be summoned from shards' list, along with shredder. the other three appear to be fair game for now.

Didnt we have a boosted summons for Shredder? I rarely pay attention to those unless im pretty sure I'm right on top of mercy

We have one right now for Shredder

We did have a Shredder boost, but they sometimes make event toons available to pull from shards only during a boost....like they do with Faction Unities.

currently ongoing. much like with the faction unity champions, boosted summons will be the only time you can get shredder from shards.

Lots of people will have Donnie & Mikey from in-game activities already, and both Raphael & Leonardo had boost events over CVC earlier this week.  It is easily conceivable that some players have all four already.  

It is also a pretty good bet that Raphael will be available from a Deck of Fate in a few weeks, which means that there will be a boat load of people with at least 3 Turtles down the road.