I agree with your point that the trade makes sense when looking at the talent. Yes, I would, in a vacuum, rather have 2 of those guys than one. My concern is how you fit 2 rookies, even talented ones, into the rotation of a team that is playing to win.
I think we are on the cusp of contention right now. Are we top contenders? No. But we're currently the 2nd best team in the conference, only a couple games behind last year's champs in the standings, and rated one of the top 6 teams in the league by most of the power rankings out there. We beat both CLE and GS in the last two weeks, and our winning % when all our starters are healthy is over .700. I think we have a decent chance of making the conference finals (TOR and WAS are both pretty good too), and if we get there, have at least a chance of getting past CLE, especially if Love isn't back. A lot would have to go right to get to the finals, but being a contender means that we're in the conversation. If there is a decent chance of making the conference finals, then you're a contender.
My concern would be that to try and fit in two more top tier rookies next year, the team would have to take a step back for a couple of years to develop them or waste a couple of roster spots to leave them at the end of the bench. Brad has done a good job this year in working Jalen in without disrupting the team's overall performance. Not sure that would be as easy trying to rotate two rookies through.