With current roster they have I don't think they need Giannis on their team.
I guess what they need is good rotation since they already have good shot to win a championship this season. If it happen that they trade their young valuable piece its like they are risking their future. Knowing KD he usually leave especially if he think that he's on losing team. So best to retain everyone and focus on their development. Let KD lead them and they might get good experience from a veteran star like him.
Agree to that, knowing KD better not to take that risk as he can easily decide to leave if he thinks that there's no chance of winning, just look on how he abanoned both Nets and Suns, after these two squads brings him to have that chance but did not materialize, now, we again see another transfer and this time to a much younger team who shows decent performance last season, a matter on how the management especially the mentor who will guide them together.
So its better for Rockets to retain their current roster and not to push any trade just to get Giannis since it will just ruin their organization then they might undergo on rebuilding process for long time again.
They already have the best assets that could able to deliver them a championship and what they need to do is to work out on their team chemistry so that they would became more effective on each play they set.
KD is I think enough since having two big stars on their team might create chemistry problem.
Agree to that, having KD as your main scorer may give them a good chance to reach the finals, though still too early to conclude, but in terms of winning it's a obligation of the coach on how he will play his players, chemistries is very important and establishing it togehter will be a big task especially having KD coach needs to blend him to other players that will be fit on how KD plays the game.