Taking an EOTG sidesteps the issues of eating Special or Rare point allotments. You get the Ancient (the one you want, as others have mentioned), and you replace the useless blowpipes (srsly, we have poison spam for Core, we don't need more) with the super-awesome Hax Engine. Also, it would be unusual you don't have points for one, as your only competition for points in Heroes is Scar-Veterans, who are dirt cheap.
On the subject of Rare, by the time you allocate points towards Rare (after taking the mandatory Core, Slann+TG block, and EOTG), you have like 300pts or so to play with. And nobody is going to take one unit over several, especially not one Steg over multiple Salamanders. And Razordons duplicate what our Saurus already do (pump out the S4, and in combat where things actually hit eachother).