I assume, the paid house is partially cause of Sage and her parents, following the story, i won't think, MC's granddad is paying anything within his grandsons range (but this could also be another blind alley by DPC).
The DIK's house is paid because it's Rusty's dad, if somebody with the financial background and a connection to the MC (B, R or anybody else) would do something good for him, he rather would intervene funding his tuition, helping with the DIK's house or anything, which would directly affect the MC.
If Lynette really left Neil and her dad rewarded her, it would have been a long time ago and i don't think it would last until now, maybe the funding of the HOT's house will be revealed in the next eps.
I also don't think, the pregnancy test will refer to Lynette, not believing the myth of Maria, we all know, that Lynette was pregnant with the MC and it would no surprise (even when it was during college). This would rather be in another flashback during the diary reading.