Why is Chimaera absent from my Fleet Arena shard and does this mean I shouldn't develop it?

For those who might be interested, took the TIE Bomber out on its first few runs today and it was devastating. Going to miss 5* on the galactic chase unfortunately, but even at 4* (L85, maxed abilities) it hits harder than its 25k power suggests. If you max out third ability, Rebels can't attack out of turn while burning which undermines Home One's strategy completely (against AI especially).

Time to upgrade that Chimaera