Can we get him by trading for a big expiring contract with the TPE and trading that deal plus picks/prospects for Lowry? I don't see how we won't be a contender with him as long as we keep our core 4 + Theis and sign a bit of depth - that's 2 All-Star level guards, two really good wings who're on the fringe of All-NBA, a guard/wing hybrid who's a top 40-50 player, a very underrated starting calibre centre and some bench pieces who fill out the rest of the rotation.
For people who're sceptical of Lowry's fit next to Walker, he played full-time SG next to VanVleet last playoffs and did well (he also played quite a bit of SG in Toronto's title run whenever the Raptors went small).