«كَانَ آخِرَ الْأَمْرَيْنِ مِنْ رَسُولِ اللَّهِ ﷺ تَرْكُ الْوُضُوءِ مِمَّا مَسَّتِ النَّارُ»
The later of the Messenger's two practices was not performing ablution after eating food touched by fire.
Jabir's expression «آخر الأمرين» offers explicit chronological information. The fact that one Companion lived later than another does not itself reveal which practice was taught last, whereas an informed statement naming the later practice is relevant evidence.
Other texts and juristic details must still be studied in a full legal ruling. The methodological point is that a Companion's clear account of the chronological order can establish the sequence.