I have a minor nitpick with the lead synergy article.
Why not lead with metagross in the starmie/metagross combo, as it beats more of the 11 leads you posted then starmie does.
I will assume my personal favourite set which is the lumgross with meteor mash, SR, bullet punch and explosion.
Azelf: Metagross does better unless mash misses but hey its not as risky as hydro pumping
Aerodactyl: Metagross
Swampert: Starmie
Metagross: Starmie
Jirachi: probably metagross depends on their move choice and the set
Infernape: Starmie
Machamp: Metagross
Roserade: Metagross
Tyranitar: Metagross
Gliscor: starmie
Heatran: Starmie
As you can see we sit at Starmie 5 and metagross 6 although starmie comes back further down the list which leaves us at the conclusion
If you hate machamp, lead with metagross.
Wow i answered my own question, awsome, however I would like scofield to give us a slightly larger insight.