Are we talking OU? You can use leer on a predicted psychic type switch in like Zam and blast it with Earthquake/Hyper Beam. And I think the consensus is that Low Kick>Submission because of the flinch on paralysed normals.
Champ needs protecting from special attacks so you'll need monsters who can switch into those. It's hard to fit all that on a team plus Champ, Tauros, Lax. And I don't think a team really needs more than 2x physical attackers anyway. So I usually drop Tauros for Champ (I know Smogon traditionalists will hate this suggestion LOL). If you really want to use a specific Pokemon you have to be willing to think outside the box and just have fun.
Egg, Starmie, Champ means triple weakness to Zap. I'd consider sticking Joelton on that team to deal with Zap and Starmie, as Champ hates both.
Yeah, I considered these things. My reasoning is that if you're using Machamp you are losing a lot of power level so you need to optimize everything else, which means you won't be able to cover all of the matchups defensively.
Triple weakness is bad but everything is fixed in such a way you'll have a way out (with Selfdestruct, Explosion or Reflect Chansey) for what is a nightmare matchup. Tauros is not necessarily going to take the sleep, it depends on how the early game plays out.
Hopefully the team is going to have 2 weaknesses to Zapdos.
I agree with you on wanting to drop Tauros if Machamp is your superstar, so I realized I can just shift Tauros to the lead because it's the most proactive pokemon among the good ones (the top six).
I also agree that you might find more creative builds that work better, but I'm not very impressed with Jolteon at first glance: Rhydon is much better even if it doesn't fit well. Jolteon won't solve many problems because it will switch into Zapdos or Starmie, it will get crippled and it won't fight with them.
Jolteon only works consistently in a defensive team, basically it needs a couple of counters for Snorlax and Tauros (just like Cloyster and ReflectRestBoom Snorlax).
Low Kick + Submission is just like Body Slam + Hyper Beam. Low Kick is arguably better, I agree, but it won't even 3HKO Cloyster. Submission looks very important for finishing the things Machamp is meant to punish.
I don't like Leer on a hit and runner, I think you are just using Body Slam looking for paralysis and HB for the KO. On top of that Machamp is a glaring case of 4MSS.
Leer can help against Reflect Snorlax, if anything.
The kangaskhan smogdex entry suggests that "Mega Kick is a valid option for 2HKOing...Starmie, and Tauros." That seems unlikely, am I missing something?
Mega Kick followed by Hyper Beam enables a 2HKO on Starmie unless extremely low rolls happen, MK won't 2HKO though.
MK+HB can't 2HKO Tauros. MK is definitely a good option but it's not enough to redeem Kangaskhan.