Image from tweet was automatically set as featured image and was also inserted in post.
At first, I didn't noticed this because my tweets are designed like asides (just plain text, no header etc). I stripped it off the featured thumbnail on the loop. I noticed this when I went to the permalink of the converted post itself. And on single page, I have the featured image showing by default if there are any set which I utilize heavily.
So aside from the image appended on the end of the post, the featured image is also visible. I am not sure how I could selectively set a specific image showing only while on the front page and on its single page.
Hopefully, there is an option on setting image from tweets as its featured image or post inline on the post.
(or maybe I could just omit the codes on the backend that appends it on post and re-CSS my tweets to show featured thumbnail also?)(I don't know PHP)