ثُمَّ يَخْطُبُ، وَيَسْتَقْبِلُ الْقِبْلَةَ بِالدُّعَاءِ،
Translation: Then the imam delivers a sermon and faces the qiblah for supplication.
Thumma yakhtubu places the sermon after prayer. The instruction to face the qiblah applies to supplication.
The two students connect the prayer, sermon, and du‘a while differing on the number of sermon addresses.