The talent level difference between the 3rd or 4th best OT Fashanu / Lantham... is minimal compared to guys like Guyton, Paul, Mims, Morgan and Suamataia... It really is. Once you get past the guys like Alt, Fuaga, and Fautanu (and we likely will) - It's 6 one and half dozen the other with all these OTs from the mid 1st to mid 2nd round.
And isn't that what ultimately makes you think that the Saints will end up drafting one of the guys in the OT tier ahead of Guyton, Paul, Mims, Morgan and Suamataia? They find a player they want and target them, after all.
Genuine question, and one we can't know the answer to, is how big a grade difference do the Saints hold on Latham/Fuaga/Fautanu and one or more of those other guys behind them?