I think taking Naivalu over Morahan was maybe a mistake. Not on talent. More for a couple of reasons.
First, Morahan has been in excellent overall form.
Second, I think Sefa needs a full preseason. The broken leg let him work on his somewhat underdeveloped physicality, and that has improved. He's a much more imposing specimen, and his strength in contact, both on attack and line defence has improved massively.
The lightning that made him such a standout, for Box Hill, the Rising and the Rebels in 2014-15 isn't at the same level anymore. I would think that a full preseason in an attempt to find a balance between his current physique and fitness, and the original one, would have been more beneficial, given he was capped already.