345 skills

I know this has been discussed ad nauseum before, but I'm posting this to clarify(for myself) skills we need for this team. On (simplistic) offense we expect:

#3 - shoot 3's and long range jumpers
- weak side last-option scoring
- competent passing
- effective picks

#4 - midrange jumpers/ some post play
- rebounding
- effective picks

#5 - Post play scoring
- rebounding

On (simplistic) defense we expect:

#3 - Defend post and perimeter

#4 - Defend post/midrange
- boxing out/rebounding

#5 - Defend post
- boxing out/rebounding
- blocks

On our team, we have:

KT - Post play scoring
- rebounding
- Defend post and perimeter (maybe)
- effective picks
(#5 offense/#3 defense)

EG - shoot 3's and long range jumpers (maybe)
- weak side last-option scoring
- competent passing (nope)
- Defend post/midrange
- boxing out/rebounding
- blocks
(#3 offense/#4 defense)

MoTay - midrange jumpers/ some post play
- rebounding
- effective picks
- Defend post
- boxing out/rebounding
(#4 offense/#5 defense)

So can these three play the 345 together? Isn't it difficult to replace just one without needing to replace all three?