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In my opinion, too loose a fit does indeed create more and deeper creases.
Cracking comes about when the leather dries out to some extent and is not kept clean. Dust and other micro-abrasives get into the creases and the flexing action of the shoe cause the leather to be abraded by the dirt. Polish and conditioners containing heavy fats attract and hold the dirt to the surface of the leather, creating what is fundamentally a piece of sandpaper. The resulting abrasion cuts the fibers of the leather.
The deeper the creases the more surface area to attract dirt and the more 'action' to abrade fibers.
A closer fit will certainly help, but keeping your shoes clean is the best way to ameliorate cracking.
That said, ultimately, all leather will crack esp. if it dries out.
Cracking comes about when the leather dries out to some extent and is not kept clean. Dust and other micro-abrasives get into the creases and the flexing action of the shoe cause the leather to be abraded by the dirt. Polish and conditioners containing heavy fats attract and hold the dirt to the surface of the leather, creating what is fundamentally a piece of sandpaper. The resulting abrasion cuts the fibers of the leather.
The deeper the creases the more surface area to attract dirt and the more 'action' to abrade fibers.
A closer fit will certainly help, but keeping your shoes clean is the best way to ameliorate cracking.
That said, ultimately, all leather will crack esp. if it dries out.