If one says the takbir of ihram while the imam is in ruku', and the imam rises from ruku' before him, is he considered to have caught up to that rak'ah or not?

Question:
When I come to the prayer and find the imam in ruku' in the first, second, third, or fourth rak'ah, I say the takbir of ihram and find that the imam has already risen from ruku'. Do I consider myself to have caught up to this rak'ah or not? Because I entered the prayer with the takbir of ihram?

Answer:
May Allah reward you with good. In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds, and may Allah send prayers and blessings upon His servant and Messenger, our Prophet Muhammad, and upon his family and all his Companions. As for the one who comes while the imam is in ruku', he says the takbir of ihram while standing, then he goes into ruku' with the imam. It is recommended (mustahabb) for him to say the takbir for ruku' in this specific situation; in other situations, it is among the obligatory acts of the prayer. So he says the takbir of ihram, which is a pillar of the prayer, while standing, then he goes into ruku'. It is better for him to go into ruku' with another takbir for the transition, as we mentioned. If his hands reach his knees before the imam raises his head, he has caught up to the ruku'. He then says "Subhan Rabbi al-Azim" (Glory be to my Lord, the Great) and catches up with the imam, raising his head. However, if his hands do not reach his knees before the imam raises his head, and this latecomer has not bent down so that his hands reach his knees, then he has missed the ruku'. He must perform a rak'ah after the imam's taslim, because he has missed the ruku'. Yes.