John McClaine works best alone
This is what made "Die Hard" the best film in the franchise.
Pairing him up in the sequels didn't work. Why has it taken 5 sequels to work this out.
All the best heroes and villains in movie history have worked solo.
Mad Max
Jason Bourne
James Bond
The Terminator
Chigurh in No Country for Old Men
and so on.
If you have partners, they speak to each other. Solo people speak when it is only necessary and to other people who are going to let them progress.