The Khalaf of Abu Bakr

From the first verse of the Qur'an, he basically got to the conclusion that. and this verse also indicates the Khalaf of Abu Bakr. There are some verses that are perhaps a little bit, perhaps more indicative than others. Of them, of course, is the verse that talks about Abu Bakr. So they say, if he is the second of the two, then when the first one is missing, who is left? Abu Bakr, right?