It's a possibility. Zenos does have shades of Solus' theatrical nature - and one has to wonder how much influence Varis had in raising Zenos compared to Solus. Very little of what Zenos did actually served to benefit Garlemald - and his cruelty caused many of his enemies to ignore the mercy and honour that other major Garlean figures had shown. One has to wonder if Zenos was 'brought in' specifically to undo all the good that Gaius had accomplished.