Does a late LOR affect application if I already have enough LORs?

[VickyG]

Hi everyone. Normally schools require 3 recommendations. So I spoke to 3 former mentors/employers to write me LORs.

However, a couple of programs only require 2, yet they left a 3rd space for an additional LOR (min. 2 max. 3).

One of my 3 LOR writers has a history of skipping e-mails randomly and nearly missing deadlines. But he is an ideal reference.

Should I put him in the additional space? (I already have 1 academic 1 employment ref)

1. If my application is considered complete once 2 LORs are submitted, it doesn't hurt if I put him as additional prove of my abilities.

2. But if application is only considered complete when ALL the letters are submitted, I would drop him to avoid risk.

Do anyone know which is the case? Thanks!