I don't pretend to know how that would be scored, but if you have zero type ratings, I believe it would be helpful to demonstrate your ability to train and succeed as a jet PIC. Based on other comments, perhaps there are some guys out there that aren't aware WN has forgone the B-737 type requirement for a number of years. Even if Delta perceived that credential as a precursor to targeting Southwest as a career choice, so what? I think airlines love to poach from each other's talent pool. I did not read back to see if you gave a snapshot of your quals earlier in the thread, but I'd say if your are a regional captain with a type on your certificate, or a military AC, the 737 rating might not be worth the time and money. I got they type 26 years ago with Southwest as my goal and I was stuck in the right seat of a Saab 340. After getting a turboprop type rating also, the 737 type got me an interview and offer at WN, and I think it may have been a factor in getting me "in" at NW/DL. Certainly nobody seemed to view it in a negative light during the interview, and it could have been a big plus.

If you'd like to have the type in order to go on the international contract market or fly BBJs later in life, keep in mind you have high odds of getting a 737 type once on the property at Delta. I put off buying a house to fund my type, but eventually I did purchase a home as a regional F/O. I was unsure of the investment wisdom for many years. But looking back and recognizing that it may have sealed a deal for me and now allows me to do some fun side work, I have zero regrets.