record the practice. play it back either alone or with the band leader, and map out the uneven tempo changes. rehearse the song, and rehearse specific sections until each one is even, then combine the sections.

if you have a drummer who dgaf because he's the badass drummer who brings tha noize and energy, then you're fucked. you can't have a sloppy drummer leading the band from behind.

call Ringo

>>130876801
get him to practice triplets or GTFO

>>130876801
Just keep bitching about it until it sinks in.

>>130876801
Can you blame him? The guitars are too stock

>>130876801
my answer which has 34 years of band experience of all kinds depends on you first answering theses 3 questions...
does he own his own his drumset?
does he provide the practice space?
does he provide the van for gigs?

>>130876801
that's a rare pepe

>>130876836
what if he's the leader?
>>130877917
>does he own his own his drumset?
no
>does he provide the practice space?
no, but schedules the reshearsals
>does he provide the van for gigs?
no

>>130878016
those 3 answers you provided speak for themselves. the drummer provides nothing of value as far as being in a band which you view as becoming 'successful'
anybody can be plugged into that drum stool.
however, does he get along with everyone? is he funny? self deprecating? actually shoes up? doesn't rock the boat with compositions and knows his role yet just lacks the seasoning of practice/talent? those guys are essential so keep him around at arms length after your next drummer doesn't work out.

play to a metronome

Fire him

>>130876801
you have to throw a cymbol at his head and hell get stronger from the brain damage