I don't have anything for this season, but Gabe Vincent grabbed 25 boards without Kyle Lowry in the 2022 playoffs.

gabe vincent rebounds and assists without kyle lowry this postseason
NAMEDATETMOPPREBASTMINPTSSTLBLKTOVFGMFGAFG%3PM3PA3P%FTMFTAFT%PF+/-
Gabe VincentGabe Vincent4/24/2022
MIAMIA
@
ATLATL
3427111004944.43650.0003+19
Gabe VincentGabe Vincent4/26/2022
MIAMIA
vs
ATLATL
443092013837.51250.022100.01+9
Gabe VincentGabe Vincent5/2/2022
MIAMIA
vs
PHIPHI
33291010241233.31714.311100.02+1
Gabe VincentGabe Vincent5/4/2022
MIAMIA
vs
PHIPHI
332870023742.91425.0003+10
Gabe VincentGabe Vincent5/10/2022
MIAMIA
vs
PHIPHI
5228151005771.41333.344100.01+20
Gabe VincentGabe Vincent5/12/2022
MIAMIA
@
PHIPHI
262771043837.51425.0001+11
Gabe VincentGabe Vincent5/17/2022
MIAMIA
vs
BOSBOS
23341703151050.03742.944100.04+23
Gabe VincentGabe Vincent5/19/2022
MIAMIA
vs
BOSBOS
33241400251050.04850.0003-3
Average
3.13.528.411.30.80.41.54.08.945.11.95.136.61.41.4100.02.311.3
Total
2528227906312327145.1154136.61111100.018+90
StatMuse has game-level data for assists going back to the 1965 playoffs.