First about Indurain:
Indurain rode only one WC and won it. He rode one Olympics and aslo won it. He won 8 out of 10 TT's in his reigning Tour de France period 1991-1995. That two he had lost were at the very end of the race where he was many minutes ahead of oppostion, so he probably eased up in those. He won 4/6 TT's in Giro. He won 7 Grand Tours mostly due to TT ability. What he has done in 1990-1996 period was total dominance in time-trialing. If the WC was held in those years Indurain would be a multiple champion, no doubt. For me, his achievements stands above Remco's, at leatst for now.
Coppi was an Hour record holder, multiple winner of most important TT races from that time , GP des Nations - won 2/4, GP Lugano and Trofeo Barrachi (yes it was not an ITT but a couple TT, but was a major TT event in which individual TT skill had great importance). Won multiple Giro and Tour time trials, although there weren't many of them in those days. his win rate was 50% or above for the whole time until his last two season when he was 40-year old. I wouldn't say he was superior TT-ist than Remco, but I wouldn't say that he was lessr either. Remco will certainly surpass him but for now i would rank them as equal.
Moser, also an hour record holder, 14-time GT ITT stage winner (although you're right, mostly Giro). Funny, PCS counts him 41 win, but you count 17 (though to prologue wins I guess, but those are also TT's). I agree with you here, though, I count Remco higher than him in the ITT hierarchy.
Hinault, 51 win listed on PCS, 5-time winner of the GP des Nations (sort of an unofficial WC), 26 times Grand Tour ITT stage winner! (20-Tour de France!!!) No, I don't think Remco is there yet...
Anquetil, Merckx and Cancellara I won't even elaborate. They are simply better.