Chapter 16

Paul turns to offerings (money) that he directed them to collect, as he also directed other churches to collect. 

2021-2, This verse:

2 On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come. [1Co 16:2 ESV]

This seems to be a separate thing than the tithe.  This is something extra that is to go to Jerusalem.  It is not required of the church, but it is individuals who are being urged to sacrifice for other Christians as God prospers them.  This is not tithe, but something over and above tithe.  Paul wants this over and done by the time he gets there, so that it only needs to be taken to Jerusalem, presumably by men appointed to do so. 

2025 - This verse:

12 Now concerning our brother Apollos, I strongly urged him to visit you with the other brothers, but it was not at all his will to come now. He will come when he has opportunity. [1Co 16:12 ESV].

So Paul was not in "command" of Apollos.  Paul is an Apostle, yet he does not have power to order Apollos to go to Corinth, and Apollos seems to have said more than no.  It is like Corinth was the last place he might want to go.  Peter was also an apostle, so if Peter was the Pope, and everyone had to do what he said, we would need to prove he was more than an apostle.  I don't think that can really be done convincingly.

Here is an interesting verse:

13 Be watchful, stand firm in the faith, act like men, be strong. [1Co 16:13 ESV]

So much for "brothers" meaning "brothers and sisters".  He is not telling both the men and women of Corinth to "act like men".  It is the men only.  The whole letter is to the brothers, NOT to the brothers and sisters.  Each brother can and should teach his own wife, but this makes it clear exactly who the letter is meant to reach.  Deal with it.  ESV turns right around in the next verse, where Paul addresses "brothers", and tries to tell us he means brothers and sisters.  HE DOES NOT!  In that culture at that time, Paul meant men, males, guys, dudes, and them only.  There are NO separate instructions here for the women.  He is directly addressing men and only by extension women.  This "brothers and sisters" thing is a very disappointing obsession of the ESV, and it is entirely in error.  I would extrapolate this verse to all of Paul's letters.  He sends the letter to the men, to the heads of the households.  It is a hierarchy that he has gone to great lengths to explain in this letter.  He does not explain how it is supposed to work and then circumvent everything he's said in the same letter.  It is a hierarchy, men, then women.