Why does roofing occur despite the difference in chemical shift?

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SUMMARY

The discussion centers on the phenomenon of roofing in NMR spectroscopy, specifically in the context of di-n-butylamine. The J values are noted as 7.2 and 7.1 for the triplets, with chemical shifts of 0.93 and 2.62. The conversation also questions whether the system is an AMSX or AMX spin system, indicating the complexity of interpreting NMR data in this case.

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TL;DR
This is a spectrum of di-n-butylamine. I'm really not good with spin systems and would like your help. I thought secondary spin systems would only occur when the chemical shift is similar to the coupling constant. But this doesn't seem to be the case for the triplets.
IMG_20201030_125822.jpg

J is 7.2 and 7.1 for the triplets (7.2 for the pentet, 7.1 for the sextet), chemical shift 0.93 and 2.62Also is it a AMSX or AMX spinsystem?
 
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Di-n-butylamine
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http://web.mnstate.edu/marasing/CHEM429_2008/Documents/1_H_NMR_Interpretation.pdf
 

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