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Oh, Dex has shown himself. Well, if he shares the same opinion, there's nothing to argue about.
Version 3.1 is interesting: pairs where everything seemed predetermined are being re-evaluated, and new strategies and replays are being found. Razazak is apparently also powerless against Sinistar; we need to try this pairing as well. Although Razazak is interesting for strong players, it's clear that he was given too little at the start, just like Garun and Deleb. A little more power, and he would be a bestseller. He lacks the strength to defeat the heroes he was designed to counter.
Air Elemental - Ossir: here, Ossir can offer a lot to share – he can share Ents, Archers, or even Druids. What he should share is a very complex question. For example, shared Ents are quite quickly defeated, and in a tactical setup, you can easily run into a situation where Crystal + Griffons = no Archers, and there are no cells to retreat to. Or maybe it's not worth sharing anyone at all, and it will be easier to run away from the Crystals, and the Griffons are still quite often (even when morale is low) caught by 12 Ents. It is very difficult to determine what Ossir should do in this setup; I would still not share anyone, or I would separate a group of five Druids.
P.S. Razazak is still stronger than Sinistar