Munster skipper O'Mahony follows Sam Warburton, Ken Owens and Alun Wyn Jones in leading the 2017 Lions in what has been billed the "fourth Test".
"There's some clarity and familiarity on how we want to play the game that's been good - we didn't get the whole team until Sunday", Cooper said.
Replacements: 16-Hikawera Elliot, 17-Chris Eves, 18-Marcel Renata, 19-Leighton Price, 20-Kara Pryor, 21-Bryn Hall, 22- Ihaia West, 23-Rob Thompson.
The 80 minutes also showed which players are now out of Test contention: Jack Nowell, Seymour, Greig Laidlaw, James Haskell and Iain Henderson are destined to stay in the midweek side for the rest of the tour.
With Conor Murray so effective from scrum-half last weekend, the Lions should benefit from having the familiarity of the Irish duo at half-back - but if Farrell starts against New Zealand he won't have had much game time with Murray, the man most likely to wear the No 9 shirt in the Tests.
The Lions are already sweating on the full match readiness of tour captain Sam Warburton, who may yet not be in a position to start the first Test.
"Peter is a proven captain with Munster", the coach said.
"Johnny needs more rugby and we're building on that", said Gatland of Sexton.
"Ross [Moriarty] has been back in training doing a little bit of running, and hopefully he'll come through as well".
The hosts tested fullback Jared Payne under the high ball early but he proved up to the challenge, prompting them to send the ball wide.
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However, Germany were awarded a penalty on the stroke of halftime when Leon Goretzka was brought down. Of course, another reason for Australia's slow start was that Germany were simply very good.
"We've just been caught on one or two occasions, and I think the players will learn from those occasions".
"Even though it's a strong side we have to make sure we aren't fully showing our hand", said boss Warren Gatland.
The Lions struck back quickly through their best-worked try of the tour, when speedy England centre Jamie Joseph was put into space and was barely touched in a 30m run to the line.
Elswehere, Ben Te'o is alongside Jonathan Davies in the midfield, with George North, Anthony Watson and Leigh Halfpenny in the back three.
"They'll be wanting to do that in all three Test matches and it nearly takes a bit of a shine off everything they've achieved in the last couple of years if they don't".
The British & Irish Lions will face the Maori All Blacks at 7.35pm Saturday.
Veteran loose forward Liam Messam (43 Tests) adds strength to the pack along with flanker Elliott Dixon and prop Kane Hames, with hooker Hika Elliott on the bench.
Naholo was among his Highlanders' team to play against the Lions last night.
"We experienced a powerful Powhiri on Monday which really resonated with the boys and it's been great to be here in Rotorua and feel all the support".
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