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LM5168: LM5168P or LM5168F?

Part Number: LM5168
Other Parts Discussed in Thread: LM5180

I'm building a small fly-buck circuit using a LM5168. This circuit is used in battery backup/sleep mode where I need an isolated 12V and a non-isolated 12V. In backup mode the consumption on the primary side is less than 50uA and on the secondary (isolated) far less.

The LM5168F is meant for fly-buck and runs in CCM mode whereas the LM5169P will switch to pulse skipping at very low loads. The latter would enable a much lower power consumption in backup mode. Because I know the secondary side will always use far less current than the primary could the LM5168P then also be used for fly-buck?