Jesus was both properly divine and properly human together in one entire person. Now as being divine, he had an inherently infinite and direct value to the scale of inifinity, which directly infinite value he did not honestly possess as a typical Jewish man, when considered as a common man and as a man alone. However, since the "Son of David" (his humanity) was joined to the same entire person that the Son of God (his divinity) was joined to, that humanity enjoyed an associate or indirect value to the scale of infinity, by virtue of the fact that his manhood was a part of the whole person in which his proper divinity was still placed. So, when Christ the Messiah died, he did not die in his divinity, (an utter impossibility,) but he died only in his humanity, but this humanity was reckoned as though it were infinite in value, since it was still a part of the entire person in which was a truly infinite, divine, peerless and now highly unique being.
Therefore, since Christ had an indirect or associate infinite value as a common Jewish man, when he died, that death accrued an infinite valuation to redeem any proposed infinite number of sinners, regardless of the cost involved in their redemption. This is why the Lord only needed to "descend into the heart of the earth" for 3 days: Since this unique being was indirectly infinite in personal value, the loss involved in his death was likewise a truly infinite loss, and so no further punishment was requisite subsequent to his death, since no further punishment could ever exceed the value of the death which he had already accomplished upon the cross. Christ descened into the nether world of the dead not so much to suffer further for sins as some think, but only to fulfill the procedural requirement of the law for a sinner to go to the place of death for sins, and the cross of calvary was not really the place of death, only access to the place of death...Sheol.
I also conjecture or propose that you will find upon your perfecting study of the death of the Messiah in eternity, that the angels guarded the corpse of Jesus within his cold and cheerless tomb, as that was where the divinity of Christ was temporarily stored for further use. Christ the Messiah had descended into the realm and state of death, in which state he could never be properly considered as "dead" himself, were he still in possession of his divinity. Oh ponderous and omniscient Being! When Christ the Messiah died, he lost his physical life as a common man, but still needed his divine life not only to indirectly valuate that human loss to the infinite, but furthermore he needed to retain his primary, untouched and perfect divine life to ascend by, since he could not ascend purely as a man as that life had been properly lost upon the cross. He needed to be a true man to fulfill the letter of law, a true man to die as though he had disobeyed that law...needed to have an infinite valuation placed upon an otherwise finite human loss...and yet still needed his divinity not in order to descend into Sheol, but rather to escape from it.
What this priceless, matchless and beneficent Being did would be absolutely impossible for anyone other than a being who was both properly human and divine, and so avoid like a black plague from gehenna any teaching that robs Christ of his full manhood and full divinity. Such a preposterous, so called "redeemer", would be absolutely useless for our redemption, but praise God, he who is the "Son of David" is likewise the "Son of God".