We've had some good succes with "shorter" CBs
Marquez 184 cm
Umtiti 182
Puyol 178
Masche 174
Lenglet is not much taller at 186, the same as Upamecano who a lot of people here wants.
And don't forget Sergio Ramos is also "only" 184 cm.
I think if everything works out ok Araujo could be our "on paper" Pique's replacement as a taller CB (but also faster) while Garcia could be a ball-playing CB pushing Lenglet back into a role of a 3rd CB which he was initially brought for. I like Lenglet but I think we could upgrade on him. Have no idea how/if Araujo-Garcia CB partnership would work longterm and I'd still like us to bring another CB (young but with more top level experience than Araujo and Garcia have) over the next two years when Pique will hopefully be gone but Araujo+Garcia wouldn't be the worst start to our much needed rebuild of the backline.
This season is lost anyway results wise imo so at least what we could do is giving both of them (if Garcia is bought) enough minutes to develop and also play them together in easier games to see if they can potentially be our starting CBs in future. If not we'd only spend around 20m on both of them and one/both could be sold for profit (Araujo for sure and Garcia probably as well) and replaced with better players (or players who would fit us better).