Clough took Roby's intelligent pass to conclude the first-half scoring, with Eastmond converting all five tries.
Emmitt crashed over for his first try for the club from Roby's short pass.
Two tries in two minutes by James Roby and Gareth Widdop raised England hopes.
Wellens's hat-trick try came after some brilliant interplay from Roby and Cunningham put him through from 20 metres out.
Roby Tschopp, head of shareholder group Actares, had described the pay-off as "scandalous".
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Roby spent three years as his understudy, while Moore is back from a season out on loan at Huddersfield Giants.
Saints led 30-0 at the break with tries from Chris Flannery, Jon Wilkin, James Roby, James Graham and Paul Clough.
Saints went into the games without the likes of Paul Wellens, Matt Gidley, Sean Long, James Roby and Jon Wilkin.
Roby said that she was huddling with her team at the edge of the field when they heard about five bullets.
But any doubt about the result was banished when Wellens crossed again after a clever offload from the outstanding James Roby.
James Roby and Ade Gardner also sit out the match as England look to recover from their 52-4 defeat by Australia.
Matt Gidley regained the lead for Saints, who added five second-half scores when James Roby touched down twice, along with Francis Meli.
"We have not won a trophy in a few years and for a club like St Helens it hurts not to win finals, " said Roby.
"I signed a new deal with St Helens which keeps me here an additional three years and I am very happy at St Helens, " said Roby.
The first came when James Roby's neat short pass set up prop James Graham to score, and then Wellens weighed in with his brace.
But Roby's forced pass was intercepted by Quins back rower Kouparitsas, who had an unopposed 40m sprint for his first try for the club.
Despite their shortage of bodies, Saints led inside the sixth minute when James Roby found Wilkin and his flat pass sent Wellens crashing over.
And Cunningham admits that he now expects to come under pressure for his coveted number nine shirt, from young internationals James Roby and Scott Moore.
After tries for Kirk Yeaman (2) and Tom Briscoe, Jamie Foster pulled one back before second-half efforts from James Roby, Ade Gardner and Tony Puletua.
Leeds trailed 14-19 at the break after Scott Donald and Danny McGuire's tries were eclipsed by scores from Steve Tyrer, James Roby and Paul Wellens.
Roby then barged over the line and Graham scored after the Wildcats failed to deal with a high kick from Eastmond, who also kicked six goals.
And before Leeds had time to regroup, Roby further extended Saints' lead on 53 minutes with a short-range try, courtesy of two bruising bursts from prop Nick Fozzard.
Great Britain's first scoring chance came soon after, but James Roby spilled the ball as he dived for the line after collecting his own grubber from close range.
The visitors were back level four minutes later, though, when a superb offload by Saints substitute Maurie Fa'asavalu gave loose forward Roby a clear run to the line.
Saints coach Mick Potter could solve the problem by having all three hookers in his regular 17-man team, to take advantage of the adaptability of both Roby and Moore.
Matt Gidley's early try was cancelled out by Keith Senior only for Chris Flannery to set up James Roby and Leon Pryce to add a third before the break.
The visitors started well and James Roby's clever pass put in Graham from close range, before Shenton scored against his former club after Roby, Leon Pryce and Wellens made the opening.
Joe Roby of Credit Suisse First Boston, which may face criminal charges in New York in connection with swapping hot IPO shares for banking business, left in June when his two-year term expired.
Roby's future was the subject of much speculation during the 2010 Four Nations in Australia and New Zealand but the England international recently made his commitment to St Helens clear by penning a new three-year contract.
And the lead changed hands for a third time on 50 minutes when Garreth Carvell grasped the ball from James Roby and held off the Saints cover in a 70-metre race for the line.
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