I can see this being pretty believable.
From what we've seen so far, the coach usually stays with the IGL. Since they need to have good communication in order to plan out strats and develop protocols, it makes sense that a coach would want to work with an IGL they've worked with previously. With Sykko being announced as Sentinels coach, then I think dephhh as the igl is pretty much guaranteed.
As much as people shit on TenZ, I think the primary thing holding him back this last year has been faulty shot-calling and outdated comps not-in-line with the meta. Unlike yay, who is set up to punish the enemy, TenZ still has the heavy burden of entrying site, and as the state of competitive valorant continues to evolve, it becomes much less possible for him to go onto site and get multi-kills like he used to (teams learn new and more efficient protocols, teams with comparatively worse aim learn to counterstrat superteams with amazing aim, etc.).
His aim is still very much world-class, and he certainly showed significant improvement on Chamber during LCQ. If he were given the chance, I definitely believe he can become a contender for best player in the world if they resign him to a position similar to that of yay's--for as much as people compare the two, I don't think any comparison is fair until they truly have the same role.
Now, that leaves the question of who should entry if not TenZ. Before Zellsis got announced to C9, he would've been the likely pick, but now it seems like the natural choice is who I consider to be a contender for world's best secondary duelist/flex player/entry: Zekken (not to mention Sykko also has experience working with him so there might be some minor past-org-nepotism involved in the decision.
so with Tenz as the awper, dephhh as the igl, and Zekken as the entry/secondary duelist, all that's left is an extra flex initiator + defensive sentinel for 3 initiator comps and an independentish, high-fragging clutch smokes player that won't take over dephh's igl spot. dapr has continuously proved himself hard carrying maps during LCQ so I truly believe in him. As for smokes, Marved is the natural choice, plus it's hinted at anyways if sinatraa is anyone to believe.