Gradel scored his second and United's fourth after Rovers keeper Gary Woods had denied Billy Paynter.
The band has made strides to embrace their image and be "in on the joke", says Paynter.
Paynter started his career at Port Vale and had spells at Hull City, Southend United and Bradford City.
The club have been in discussions with in-form Paynter for the past month.
But it was at the County Ground where Paynter found his best form, as he scored 51 goals in 137 appearances.
Meanwhile, striker Billy Paynter is still in talks about his new deal.
He faces competition for a place up front from the likes of Billy Paynter and fellow loan signings Tope Obadeyi and Ben Hutchinson.
As despair spread among the Brentford players in the frenzied scrum that ensued, a clearance found Doncaster's Billy Paynter, perched wide right, close to the halfway line.
Fellow opener David Paynter joined his skipper back in the dressing room having scored 20, a leading edge off Killeen presenting Gary Pratt with an easy catch.
Pericard is the first signing in the January transfer window for manager Danny Wilson but faces competition for a place in the line-up from in-form forwards Charlie Austin and Billy Paynter.
"Robbie stepped aside because he signed up as president to organise events and run a student society, " said Michael Paynter, secretary for the National Federation of Atheist, Humanist and Secular Student Societies.
"They have been ridiculed for doing formulaic rock'n'roll, but one of the things that people forget is that they are giving a huge subset of fans out there exactly what they want, " says Ben Paynter, a contributing writer at Bloomberg Business Week, who recently profiled the band.
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