Brooks made 111 as West Indies managed a lead of 90 after they were 277 all out in the second session of day two.
West Indies reached 68-2 at the end of the day, further boosting captain Jason Holder's decision to send Afghanistan in to bat first.
"I don't feel hard done by. It was a long time ago now. I've moved past it and I'm focusing on the present."
Rahmanullah Gurbaz hit an attacking half-century to set up Afghanistan's 29-run series-clinching win over West Indies.
Pooran will thus be unavailable for the three T20I games against Afghanistan and the first match of the three T20Is against hosts India.
Hope registered the seventh century of his nascent yet flourishing ODI career as the islanders beat Afghanistan by a margin of five wickets.
Sheldon Cottrell, Roston Chase and Hayden Walsh each took three wickets as West Indies wrapped up the three-match series with a game to spare.
Chase and Hope put on a key 163-run stand for the third wicket as West Indies reached their target of 195 in 46.3 overs to take a 1-0 lead.
The significant overhaul of the team is symptomatic of the sweeping changes opted by the team management in the aftermath of the World Cup.
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