﴿ رَضُوا۟ بِأَن يَكُونُوا۟ مَعَ ٱلْخَوَالِفِ وَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ ﴾

“They were well-pleased to remain with those who were left behind - where for their hearts have been sealed, so that they cannot grasp the truth.”

The expression: اُولُوا الطَّولِ (ulu 'at-caul: translated as ` the capable ones' ) (86) is not for particularization. Instead, it serves a purpose. It tells that there were others too, the ones not so capable. And the incapable ones had, at least, some obvious excuse to stay behind.