Actually there are (at least one anyway

), and I tend to agree with him. If need be I'll track down the names for you.
Let's not forget that we're talking about a 20 yard gap between Maniples, that gap being covered by the Principis behind.
If it's deemed to be suicidal to leave the gap because you can be flanked, then I imagine the reverse would also be true ie- entering that very gap allows you to be flanked by the Principis, if you engage the Hastati in their flank, or by the Hastati, you are apparently flanking, if you faced up against the Principis. It works both ways.
Once the Principis were engaged, one would imagine that the Hastati would slowly back-water and switch places with the Triarii, if things were looking bad, or take a much needed rest before returning to replace the Principis and give them a breather.
My main reason for prefering this interpretation is simple.....
it's simple. No requirement for troops to carry out complicated maneouvres during the din of battle etc.
Cheers,
Quilts
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