It's a win-win for both teams IMO, why would the Phoenix keep Manuel if there's no improvement of the team. Look, they are better without Manuel and even before Calvin joined the team, Phoenix is already competing well, so I guess having two legit big men, Perkins and Chua are already good for the team, at least they can operate more as they don't have other players given the same minutes they get with the same position.
Actually, it's not that Phoenix is better without Vic Manuel but rather, the team doesn't really utilize and use him on his best because maybe of injury or still not in his usual shape. He is playing below his average on Phoenix in the last conference but on the bright side, still a good stats despite not being at 100%.
Regarding the trade, both teams win on that trade. On the NorthPort side, if Slaughter won't be traded, as he's part of the trading rumors, looking forward to their big man tandem with Vic Manuel.
Going back to the topic

we are all waiting for the next conference and we are excited to see if how good those imports from different teams, how they will help in chasing for the title.

According to Harizen, the new conference is likely to start this month, so be more patient as we will eventually witness a conference where imports could finally play. Of course, this is different from the all Filipino cup as it will be more exciting with more production from the imports, probably more high scoring games as these imports could put up good numbers every game.
Actually, I refer to how conferences are structured in the PBA.
The usual is, for every fresh start, All-Filipino is the starting conference every year. Since they are planning to have an import, the next conference should be this month or next, as it should happen this year. March is the usual restart of PBA so they still have time for the import conference this year that can last up to 2 months if games will be played mostly at triple headers and every day like they did the last conference.